@article{Westrich2008,
  author    = {Paul Westrich},
  title     = {Die Neophyten Solidago canadensis und Solidago gigantea als Pollenquellen der Seidenbiene Colletes collaris DOURS (Hymenoptera: Apidae)},
  journal   = {Eucera},
  volume    = {1},
  number    = {2},
  pages     = {30 -- 32},
  url       = {https://www.wildbienen.info/downloads/eucera-1-2008-02.pdf},
  year      = {2008},
}