@article{Petsche2010,
  author    = {Petsche, Hans-Joachim},
  title     = {It began with Pestalozzi and Schleiermacher : Reflections on the polymath Hermann Grassmann (1809 - 1877)},
  issn      = {1027-488x},
  year      = {2010},
  language  = {en}
}
@article{Petsche2010,
  author    = {Petsche, Hans-Joachim},
  title     = {Topoi der Rationalit{\"a}t : Umrisse eines Forschungsfeldes},
  isbn      = {978-3-89626-877-8},
  year      = {2010},
  language  = {de}
}
@article{Petsche2010,
  author    = {Petsche, Hans-Joachim},
  title     = {Einf{\"u}hrung},
  isbn      = {978-3-89626-877-8},
  year      = {2010},
  language  = {de}
}