@article{BuschEnglertRzazewskietal.1998,
  author    = {Busch, Thomas and Englert, Bertold-Georg and Rzazewski, Kazimierz and Wilkens, Martin},
  title     = {Two cold atoms in a harmonic trap},
  year      = {1998},
  abstract  = {Two ultracold atoms moving in a trap interact weakly at a very short distance. This interaction can be modeled by a properly regularized contact potential. We solve the corresponding time-independent Schr{\"o}dinger equation under the assumption of a parabolic, spherically symmetric trapping potential.},
  language  = {en}
}
@article{BreitenbachIlluminatiSchilleretal.1998,
  author    = {Breitenbach, Gerd and Illuminati, Fabrizio and Schiller, Stephan and Mlynek, J{\"u}rgen},
  title     = {Broadband detection of squeezed vacuum : a spectrum of quantum states},
  year      = {1998},
  abstract  = {We demonstrate the simultaneous quantum state reconstruction of the spectral modes of the light field emitted by a continuous wave degenerate optical parametric amplifier. The scheme is based on broadband measurement of the quantum fluctuations of the electric field quadratures and subsequent Fourier decomposition into spectral intervals. Applying the standard reconstruction algorithms to each bandwidth-limited quantum trajectory, a "spectrum" of density matrices and Wigner functions is obtained. The recorded states show a smooth transition from the squeezed vacuum to a vacuum state. In the time domain we evaluated the first order correlation function of the squeezed output field, showing good agreement with theory.},
  language  = {en}
}
@article{WestbrookHenkelWestbrooketal.1998,
  author    = {Westbrook, N. and Henkel, Carsten and Westbrook, C. I. and Landragin, A. and Labeyrie, G. and Cognet, L. and Savalli, V. and Horvath, G. and Aspect, Alain and Moelmer, Klaus and Courtois, J.-Y. and Phillips, W. D. and Kaiser, Rolf and Bagnato, V.},
  title     = {New physics with evanescent wave atomic mirrors : the van der Waals force and atomic diffraction},
  year      = {1998},
  abstract  = {After a brief introduction to the field of atom optics and to atomic mirrors, we present experimental results obtained in our group during the last two years while studying the reflection of rubidium atoms by an evanescent wave. These involve the first measurement of the van der Waals force between an atom in its ground state and a dielectric wall, as well as the demonstration of a reflection grating for atoms at normal incidence. We also consider the influence of quantum reflection and tunnelling phenomena. Further studies using the atomic mirror as a probe of the van der Waals interaction, and of very small surface roughness are briefly discussed.},
  language  = {en}
}
@article{PetzschmannThiessenhusenSpahnetal.1998,
  author    = {Petzschmann, Olaf and Thiessenhusen, Kai-Uwe and Spahn, Frank and Schmidt, J{\"u}rgen},
  title     = {Inelastic collisions in planetary rings : thickness and satellite-induced structures},
  isbn      = {0-7923-5102-9},
  year      = {1998},
  language  = {en}
}
@article{ChengKatiyarBaueretal.1998,
  author    = {Cheng, Z. Y. and Katiyar, R. S. and Bauer, Siegfried and Bauer-Gogonea, Simona and Gerhard, Reimund},
  title     = {Thermally stimulated depolarization current of a nonlinear optical side-chain polymer},
  year      = {1998},
  language  = {en}
}
@article{BauerGogoneaChengWirgesetal.1998,
  author    = {Bauer-Gogonea, Simona and Cheng, Z. Y. and Wirges, Werner and Bauer, Siegfried and Gerhard, Reimund and Das-Gupta, D. K.},
  title     = {Dielectric investigation of thermally-induced chromophore degradation in nonlinear optical polymer electrets},
  year      = {1998},
  language  = {en}
}
@article{RosenblumPengIvanovetal.1998,
  author    = {Rosenblum, Michael and Peng, C. K. and Ivanov, Plamen Ch. and Mietus, J. and Havlin, Shlomo and Stanley, H. Eugene and Goldberger, Ary L.},
  title     = {Scaling and universality in heart rate variability distributions},
  year      = {1998},
  language  = {en}
}
@article{ZaikinRosenblumLandaetal.1998,
  author    = {Zaikin, Alexei A. and Rosenblum, Michael and Landa, Polina S. and Kurths, J{\"u}rgen},
  title     = {On-off itermittency phenomena in a pendulum with a randomly vibrating suspension axis},
  year      = {1998},
  language  = {en}
}
@article{HnatkovaVesselVossetal.1998,
  author    = {Hnatkova, Katarina and Vessel, N. and Voss, Andreas and Kurths, J{\"u}rgen and Sander, A. and Schirdewan, Alexander and Camm, A. J. and Malik, Marek},
  title     = {Multiparametric analysis of heart rate variability used for risk stratification among survivors of acute myocardial infarction},
  issn      = {0895-2795},
  year      = {1998},
  language  = {en}
}
@article{SaparinHuppertStoneetal.1998,
  author    = {Saparin, Peter and Huppert, Amit and Stone, L. and Price, C.},
  title     = {El ni{\~n}o chaos : The role of noise and stochastic resonance on the ENSO cycle},
  year      = {1998},
  language  = {en}
}
@article{RosenblumKurthsSchaeferetal.1998,
  author    = {Rosenblum, Michael and Kurths, J{\"u}rgen and Sch{\"a}fer, Carsten and Abel, Hans-Henning},
  title     = {Heartbeat synchronized with ventilation},
  year      = {1998},
  language  = {en}
}
@article{LaiGrebogiFeudeletal.1998,
  author    = {Lai, Ying Cheng and Grebogi, Celso and Feudel, Ulrike and Witt, Annette},
  title     = {Basin bifurcation in quasiperiodically forced systems},
  year      = {1998},
  language  = {en}
}
@article{KimKurthsKimetal.1998,
  author    = {Kim, G. G. and Kurths, J{\"u}rgen and Kim, S. and Cao, L. Y.},
  title     = {Detecting determinism in human posture control data},
  year      = {1998},
  language  = {en}
}
@article{KurthsKliemSchwarzetal.1998,
  author    = {Kurths, J{\"u}rgen and Kliem, Bernhard and Schwarz, Udo and Kr{\"u}ger, Albrecht and Urpo, S.},
  title     = {Multiresolution analysis of solar mm-wave bursts},
  year      = {1998},
  language  = {en}
}
@article{PoonGrebogiFeudeletal.1998,
  author    = {Poon, L. and Grebogi, Celso and Feudel, Ulrike and Yorke, J. A.},
  title     = {Dynamical properties of a simple mechanical system with a large number of coexisting periodic attractors},
  year      = {1998},
  language  = {en}
}
@article{SchwarzKurthsSpahnetal.1998,
  author    = {Schwarz, Udo and Kurths, J{\"u}rgen and Spahn, Frank and Petzschmann, Olaf},
  title     = {Reply on the comment of "Clustering of granular assemblies with temperature dependent restitution and under differential rotation"},
  year      = {1998},
  language  = {en}
}
@article{KarolyiPentekToroczkaietal.1998,
  author    = {Karolyi, Gy{\"o}rgy and Pentek, Aron and Toroczkai, Zolt{\´a}n and T{\´e}l, T{\´o}mas and Grebogi, Celso},
  title     = {Advection of active particles in open chaotic flows},
  issn      = {0031-9007},
  year      = {1998},
  language  = {en}
}
@article{EngbertHainzlZoelleretal.1998,
  author    = {Engbert, Ralf and Hainzl, Sebastian and Z{\"o}ller, Gert and Kurths, J{\"u}rgen},
  title     = {Testing for unstable periodic orbits to characterize spatiotemporal dynamics},
  year      = {1998},
  language  = {en}
}
@article{KliemSchwarzKurthsetal.1998,
  author    = {Kliem, Bernhard and Schwarz, Udo and Kurths, J{\"u}rgen and Dennis, Brian and Schwartz, Richard and Aschwanden, Markus J.},
  title     = {Wavelet analysis of solar flare hard X-ray},
  issn      = {0004-637x},
  year      = {1998},
  language  = {en}
}
@article{SchiekDrepperEngbertetal.1998,
  author    = {Schiek, Michael and Drepper, Friedhelm R. and Engbert, Ralf and Suder, Katrin and Abel, Hans-Henning},
  title     = {Cardiorespiratory Synchronization},
  isbn      = {3-540-63481-9},
  year      = {1998},
  abstract  = {The complex behaviour of cardiorespiratory dynamics is shown to be related to the interaction between several physiological oscillators. This study is based on electrocardiogram and respiratory flow data obtained from 3 different subjects during paced breathing at 10 different pacing cycle lengths ranging from 5 s to 12 s. Two different methods ideally suited for the analysis of synchronization pattern of coupled oscillators are applied: 1. Symbolic dynamics based on symbol coding adapted for the detection of respiratory modulation of cardiac parasympathetic activity discloses two regimes of different synchronization behaviour within the frequency area corresponding to the Arnold tongue of 1:1 frequency-locking between respiratory flow and respiratory heartbeat variation (respiratory sinus arrhythmia). 2. The analysis of the phase shift between respiratory flow and respiratory sinus arrhythmia indicates that synchronization is not a static but a dynamic phenomenon. The observed dependence of the phase shift on respiratory cycle length shows large inter-individual variation. These findings turn out to be further hints for the existence of an additional central oscillator in the frequency range of respiration interacting with the central respiratory oscillator driving mechanical respiration.},
  language  = {en}
}
@article{JavanainenWilkens1998,
  author    = {Javanainen, Juha and Wilkens, Martin},
  title     = {Phase and phase diffusion of a split Bose-Einstein condensate},
  year      = {1998},
  language  = {en}
}
@article{LorenzMenzel1998,
  author    = {Lorenz, Dieter and Menzel, Ralf},
  title     = {Broadband operation of frequency doubled Cr4+:YAG laser with high beam quality},
  year      = {1998},
  language  = {en}
}
@article{LangerHeger1998,
  author    = {Langer, Norbert and Heger, Alexander},
  title     = {B[e] supergiants : what is their evolutionary status?},
  year      = {1998},
  language  = {en}
}
@article{LangerHegerBraun1998,
  author    = {Langer, Norbert and Heger, Alexander and Braun, H.},
  title     = {Nucleosynthesis in massive stars},
  year      = {1998},
  language  = {en}
}
@article{TakahashiFaestermannKienleetal.1998,
  author    = {Takahashi, K. and Faestermann, T. and Kienle, P. and Basch, F. and Langer, Norbert and Wagenhuber, J.},
  title     = {The 187 Re - 187Os cosmochronometry and chemical evolution in the solar neighborhood},
  year      = {1998},
  language  = {en}
}
@article{HegerLangerWoosley1998,
  author    = {Heger, Alexander and Langer, Norbert and Woosley, S. E.},
  title     = {Nucleosynthesis in rotating massive stars},
  year      = {1998},
  language  = {en}
}
@article{GarciaSeguraLangerRozyczkaetal.1998,
  author    = {Garcia-Segura, Guillermo and Langer, Norbert and Rozyczka, M. and MacLow, Mordecai-Mark},
  title     = {The effects of rotation and stellar magnetic fields on the nebular shapes : LBV nebulae and PNe},
  year      = {1998},
  language  = {en}
}
@article{FigerNajarroMorisetal.1998,
  author    = {Figer, Donald F. and Najarro, F. and Moris, Mark and Mclean, Ian S. and Geballe, T. R. and Ghez, A. M. and Langer, Norbert},
  title     = {The Pistol star},
  year      = {1998},
  language  = {en}
}
@article{KoesterkeWerner1998,
  author    = {Koesterke, Lars and Werner, Klaus},
  title     = {Determination of mass-loss rates of PG 1159 stars from FUV spectroskopy},
  year      = {1998},
  language  = {en}
}
@article{LangerBraunWellstein1998,
  author    = {Langer, Norbert and Braun, H. and Wellstein, Stephan},
  title     = {Massive close binaries as source of galatic 26Al},
  year      = {1998},
  language  = {en}
}
@article{WittkowskiLangerWeigelt1998,
  author    = {Wittkowski, M. and Langer, Norbert and Weigelt, G.},
  title     = {Diffraction-limited Speckle-Masking interferometry of the red supergiant VY CMa*},
  year      = {1998},
  language  = {en}
}
@article{PenaStastinskaEstebanetal.1998,
  author    = {Pena, M. and Stastinska, G. and Esteban, C. and Koesterke, Lars and Medina, S. and Kingsburgh, R.},
  title     = {Galactic planetary nebulae with Wolf-Rayet nuclei : I. Objects with [WC]-early type stars},
  year      = {1998},
  language  = {en}
}
@article{LeuenhagenHamann1998,
  author    = {Leuenhagen, U. and Hamann, Wolf-Rainer},
  title     = {Spectral analyses of late-type [WC] central stars of planetary nebulae : more empirical constraints for their evolutionary status},
  year      = {1998},
  language  = {en}
}
@article{Langer1998,
  author    = {Langer, Norbert},
  title     = {Coupled mass and angular momentum loss of massive main sequence stars},
  year      = {1998},
  language  = {en}
}
@article{KoesterkeDreizlerRauch1998,
  author    = {Koesterke, Lars and Dreizler, S. and Rauch, Thomas},
  title     = {On the mass-loss of PG 1159 stars},
  year      = {1998},
  language  = {en}
}
@article{HerwigSchoenbernerBloecker1998,
  author    = {Herwig, Falk and Sch{\"o}nberner, Detlef and Bl{\"o}cker, Thomas},
  title     = {On the validity of the core-mass luminosity relation for TP-AGB stars with efficient dredge-up},
  year      = {1998},
  language  = {en}
}
@article{HegerLanger1998,
  author    = {Heger, Alexander and Langer, Norbert},
  title     = {The spin-up of contracting red supergiants},
  year      = {1998},
  language  = {en}
}
@article{HamannKoesterke1998,
  author    = {Hamann, Wolf-Rainer and Koesterke, Lars},
  title     = {The nitrogen spectra of Wolf-Rayet stars},
  year      = {1998},
  language  = {en}
}
@article{HamannKoesterke1998,
  author    = {Hamann, Wolf-Rainer and Koesterke, Lars},
  title     = {Spectrum formation in clumped stellar winds : consequences for the analyses of Wolf-Rayet spectra},
  year      = {1998},
  language  = {en}
}
@article{GraefenerHamannHillieretal.1998,
  author    = {Gr{\"a}fener, G{\"o}tz and Hamann, Wolf-Rainer and Hillier, D. J. and Koesterke, Lars},
  title     = {Spectral analyses of WC stars in the LMC},
  year      = {1998},
  language  = {en}
}
@article{DriebeSchoenbernerBloeckeretal.1998,
  author    = {Driebe, Thomas and Sch{\"o}nberner, Detlef and Bl{\"o}cker, Thomas and Herwig, Falk},
  title     = {The evolution of helium white dwarfs : I. the companion of the millisecond pular PSR J1012+5307},
  year      = {1998},
  language  = {en}
}
@phdthesis{Wambsganss1998,
  author    = {Wambsganß, Joachim},
  title     = {Gravitational lensing as a universal astrophysical tool},
  pages     = {201 S.},
  year      = {1998},
  language  = {en}
}
@article{DarowskiPietschWangetal.1998,
  author    = {Darowski, Nora and Pietsch, Ullrich and Wang, K. H. and Forchel, Alfred and Shen, W. and Kycia, S.},
  title     = {X-ray diffraction analysis of strain relaxation in free standing and buried GaAs/GaInAs/GaAs SQW lateral structures},
  year      = {1998},
  language  = {en}
}
@article{HaierHerrmannEsseretal.1998,
  author    = {Haier, P. and Herrmann, B. A. and Esser, N. and Pietsch, Ullrich and L{\"u}ders, K. and Richter, W.},
  title     = {Influence of the deposition rate on the structure of thin metal layers},
  year      = {1998},
  language  = {en}
}
@article{StahnPucherGeueetal.1998,
  author    = {Stahn, Jochen and Pucher, Andreas and Geue, Thomas and Daniel, A. and Pietsch, Ullrich},
  title     = {Electric field induced electron density response of GaAs and ZnSe},
  year      = {1998},
  language  = {en}
}
@article{DarowskiLuebbertPietschetal.1998,
  author    = {Darowski, Nora and L{\"u}bbert, Daniel and Pietsch, Ullrich and Zhuang, Y. and Zerlauth, S. and Bauer, G{\"u}nther},
  title     = {In-plane strain and strain relaxation in laterally patterned Si/SiGe quantum dots and wire arrays},
  year      = {1998},
  language  = {en}
}
@article{StoemmerGoebelHubetal.1998,
  author    = {St{\"o}mmer, Ralph and G{\"o}bel, H. and Hub, W. and Pietsch, Ullrich},
  title     = {X-ray scattering from silicon surfaces},
  year      = {1998},
  language  = {en}
}
@article{StoemmerMartinGeueetal.1998,
  author    = {St{\"o}mmer, Ralph and Martin, C. R. and Geue, Thomas and G{\"o}bel, H. and Hub, W. and Pietsch, Ullrich},
  title     = {Comparative studies of fractal parameters of Si(100) surfaces measured by X-ray scattering and atomic force microscopy},
  year      = {1998},
  language  = {en}
}
@article{DarowskiPietschZeimeretal.1998,
  author    = {Darowski, Nora and Pietsch, Ullrich and Zeimer, Ute and Smirnitzki, V. and Bugge, F.},
  title     = {Nondestructive analysis of a lateral GaAs nanostructure buried under AlGaAs using conventional high resolution and grazing incidence X-ray diffraction},
  year      = {1998},
  language  = {en}
}
@article{BaumbachLuebbertPietschetal.1998,
  author    = {Baumbach, Tilo and L{\"u}bbert, Daniel and Pietsch, Uwe and Darowski, Nora and Leprince, L. and Talneau, A. and Schneck, J.},
  title     = {Grazing incidence diffraction by epitaxial multilayered gratings},
  year      = {1998},
  language  = {en}
}