@article{Gregor2011,
  author    = {Thomas Gregor},
  title     = {Typisierungen in der Potentilla-collina-Gruppe (Potentilla subgrex Collinae Th. Wolf). 2. Teil: Sippen mit Zackenhaaren},
  journal   = {Kochia},
  volume    = {5},
  pages     = {67 -- 82},
  year      = {2011},
}