@article{Nitzsche2010,
  author    = {Rainar O. M. Nitzsche},
  title     = {In memoriam Prof. Dr. Erwin Tretzel, 1920 - 2001},
  journal   = {Arachnologische Mitteilungen},
  number    = {29},
  pages     = {61 -- 63},
  year      = {2010},
}