@article{HaasHavelka2001,
  author    = {Dieter Haas and Peter Havelka},
  title     = {Nilgans im oberen Donautal entdeckt},
  journal   = {Carolinea},
  volume    = {59},
  pages     = {137 -- 138},
  doi       = {10.57962/regionalia-19441},
  year      = {2001},
}