@book{bhlpg48622926, title = {Schriften der Physikalisch-Ökonomischen Gesellschaft zu Königsberg }, volume = {jahrg.58-63 (1917-1922)}, url = {https://www.biodiversitylibrary.org/page/48622926}, publisher = {In Commission bei Gräfe und Unzer}, author = {Physikalisch-Ökonomische Gesellschaft zu Königsberg }, year = {1917}, pages = {Page 112}, } @book{bhlpg51487742, title = {The Zoological record }, volume = {v.59 (1922)}, url = {https://www.biodiversitylibrary.org/page/51487742}, publisher = {J.V. Voorst}, author = {Zoological Society of London. }, year = {1922}, pages = {Page 25}, } @book{bhlpg29985237, title = {Zoologischer Anzeiger }, volume = {Bd.53 (1921)}, url = {https://www.biodiversitylibrary.org/page/29985237}, publisher = {VEB Gustav Fischer Verlag}, author = {Deutsche Zoologische Gesellschaft. }, year = {1921}, pages = {Page 73}, }