@unpublished{ZerzHelmkePraetzelWolters2001,
  author  = {Eva Zerz and Uwe Helmke and Dieter Pr{\"a}tzel-Wolters},
  title   = {Mathematical Theory of Neutral Networks},
  institution = {Fachbereich Mathematik},
  series    = {Berichte der Arbeitsgruppe Technomathematik (AGTM Report)},
  number    = {238},
  year    = {2001},
  url  = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-11688},
}