@article{HubrigMathys1993,
  author    = {Hubrig, Swetlana and Mathys, Gautier},
  title     = {Mass loss, magnetic field and chemical inhomogenities in the he-weak star HD 21699},
  year      = {1993},
  language  = {en}
}
@book{HaenselNeumannWedell1993,
  author    = {H{\"a}nsel, Horst and Neumann, Werner and Wedell, Reiner},
  title     = {Physik : Bd. 1 Mechanik und W{\"a}rmelehre},
  volume    = {1},
  publisher = {Spektrum Akad. Verl.},
  address   = {Heidelberg},
  isbn      = {3-86025-046-9},
  pages     = {584 S.},
  year      = {1993},
  language  = {de}
}
@book{MarquardtMauMayerMikelskis1993,
  author    = {Marquardt-Mau, Brunhilde and Mayer, J{\"u}rgen and Mikelskis, Helmut},
  title     = {Umwelt : Lexikon {\"o}kologisches Grundwissen},
  volume    = {6337},
  publisher = {Rowohlt},
  address   = {Reinbek bei Hamburg},
  isbn      = {3-499-16337-3},
  pages     = {509 S.},
  year      = {1993},
  language  = {de}
}
@article{Mikelskis1993,
  author    = {Mikelskis, Helmut},
  title     = {Zur {\"O}kologisierung des Lernprozesses : Versuch {\"u}ber einen vernachl{\"a}ssigten Aspekt von Umweltbildung},
  isbn      = {3-89088-073-8},
  year      = {1993},
  language  = {de}
}
@book{DuitMikelskis1993,
  author    = {Duit, Reinders and Mikelskis, Helmut},
  title     = {Physik - Chemie, um die Welt zu begreifen : ein Lehrbuch f{\"u}r die Orientierungsstufe ; [Hauptbd.], Niedersachsen},
  volume    = {3675},
  publisher = {Diesterweg},
  address   = {Frankfurt am Main},
  isbn      = {3-425-03675-0},
  pages     = {80 S.},
  year      = {1993},
  language  = {de}
}
@book{DuitMikelskis1993,
  author    = {Duit, Reinders and Mikelskis, Helmut},
  title     = {Physik, um die Welt zu begreifen : ein Lehrbuch f{\"u}r die Jahrgangsstufe 5/6 ; [Hauptbd.], Nordrhein- Westfalen},
  publisher = {Diesterweg},
  address   = {Frankfurt am Main},
  isbn      = {3-425-03671-8},
  pages     = {120 S.},
  year      = {1993},
  language  = {de}
}
@article{Mikelskis1993,
  author    = {Mikelskis, Helmut},
  title     = {Zukunftsperspektiven physikdidaktischer Forschung im vereinigten Deutschland},
  isbn      = {3-88064-223-0},
  year      = {1993},
  language  = {de}
}
@article{Mikelskis1993,
  author    = {Mikelskis, Helmut},
  title     = {Schneller als der Wind : zur Behandlung des Darrieus-Windrotors im Physikunterricht},
  year      = {1993},
  language  = {de}
}
@phdthesis{Pedzisz1993,
  author    = {Pedzisz, Bozena},
  title     = {Zur Rolle historischer Betrachtungen im Physikunterricht unter besonderer Ber{\"u}cksichtigung grundlegender Experimente},
  pages     = {3, 167,73 Bl. : Ill.},
  year      = {1993},
  language  = {de}
}
@book{HaenselNeumannHudel1993,
  author    = {H{\"a}nsel, Horst and Neumann, Werner and Hudel, Erich},
  title     = {Physik : Bd. 2 Elektrizit{\"a}t, Optik, Raum und Zeit},
  volume    = {2},
  publisher = {Spektrum Akad. Verl.},
  address   = {Heidelberg},
  isbn      = {3-86025-304-2},
  pages     = {799 S.},
  year      = {1993},
  language  = {de}
}