@article{PfenningerSchwenk2007,
  author    = {Markus Pfenninger and Klaus Schwenk},
  title     = {Cryptic animal species are homogeneously distributed among taxa and biogeographical regions},
  journal   = {BMC evolutionary biology},
  volume    = {7},
  number    = {121},
  pages     = {1 -- 6},
  doi       = {10.1186/1471-2148-7-121},
  year      = {2007},
}