@article{MalzSchroeder1977,
  author    = {Heinz Malz and Heinz Schr{\"o}der},
  title     = {Fossile Libellen - biologisch betrachtet},
  journal   = {Osnabr{\"u}cker naturwissenschaftliche Mitteilungen},
  volume    = {5},
  pages     = {33 -- 59},
  year      = {1977}
}