@misc{Klotzek1995,
  author    = {Klotzek, Benno},
  title     = {Makarov, V. S., On the fundamental polyhedron of a diskrete group of motions of a Lobachevskii space, its combinatorics and deformation},
  year      = {1995},
  language  = {en}
}
@misc{Klotzek1995,
  author    = {Klotzek, Benno},
  title     = {Ruegg, A. ; Burmeister, G., M{\´e}thodes constructives de la g{\´e}om{\´e}trie spatiale},
  year      = {1995},
  language  = {fr}
}
@misc{Klotzek1995,
  author    = {Klotzek, Benno},
  title     = {Vermes, I., {\"U}ber die synthetische Behandlung der Kr{\"u}mmung und des Schmiegzykels der ebenen Kurven in der Bolyai-Lobatschefskyschen Geometrie},
  year      = {1995},
  language  = {de}
}