@article{Růžička2011,
  author    = {Vlastimil Růžička},
  title     = {Current results of an arachnological survey of some sandstone rock sites in Bohemia (so-called "rock cities")},
  journal   = {Arachnologische Mitteilungen},
  number    = {3},
  pages     = {1 -- 13},
  year      = {2011},
}