@misc{Alfken_J._D._(1862–1945)_Welchen_1941,
 author={Alfken, J. D. (1862–1945)},
 copyright={Public Domain},
 address={[München]},
 journal={Publikacje znanych biologów (zbiór odbitek OZwRCIN)},
 howpublished={online},
 year={1941},
 publisher={[Münchner Entomologischen Gesellschaft e. V.]},
 language={ger},
 title={Welchen wissenschaftlichen Namen hat die schwarze Mörtelbiene zu führen? (Hym. Apid.)},
 type={Text},
 URL={http://rcin.org.pl/Content/67829/PDF/s9.pdf},
 keywords={Insects - bees, Bees - Chalicodoma muraría Retz, Bees - descriptions of the species},
}