@unpublished{ParkMuellerKirsten2000,
  author  = {D.K. Park and H. J. W. M{\"u}ller-Kirsten},
  title   = {Universality or Non-Universality of Absorption Cross Sections for Extended Objects},
  institution = {Fachbereich Physik},
  year    = {2000},
  url         = {http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:386-kluedo-11130},
}