@phdthesis{Wessel2005,
  author    = {Wessel, Niels},
  title     = {Data analysis and modeling of the cardiovascular system},
  address   = {Potsdam},
  pages     = {Getr. Z{\"a}hlung : graph. Darst.},
  year      = {2005},
  language  = {en}
}
@phdthesis{Wessel1998,
  author    = {Wessel, Niels},
  title     = {Komplexe Analyse nichtlinearer Ph{\"a}nomene in kardiologischen Datenreihen},
  address   = {Potsdam},
  pages     = {123 Bl.},
  year      = {1998},
  language  = {de}
}