@article{Bomble2017,
  author    = {Ferdinand Wolfgang Bomble},
  title     = {Zwischen Geranium purpureum und Geranium robertianum vermittelnde Sippen in Aachen},
  journal   = {Jahrbuch des Bochumer Botanischen Vereins},
  volume    = {8},
  pages     = {48 -- 71},
  year      = {2017},
}