@article{Westrich2008,
  author    = {Paul Westrich},
  title     = {Flexibles Pollensammelverhalten der ansonsten streng oligolektischen Seidenbiene Colletes hederae SCHMIDT \& WESTRICH (Hymenoptera: Apidae)},
  journal   = {Eucera},
  volume    = {1},
  number    = {2},
  pages     = {17 -- 29},
  url       = {https://www.wildbienen.info/downloads/eucera-1-2008-02.pdf},
  year      = {2008},
}