@unpublished{Kunze2011,
  author  = {Simone Kunze},
  title   = {Das Sammelbilderproblem},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Mathematische Statistik und Wahrscheinlichkeitstheorie : Preprint},
  number    = {2010, 12},
  year    = {2011},
}