@book{bhlpg42826594, title = {Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie }, volume = {v.44(1909-1910)}, url = {https://www.biodiversitylibrary.org/page/42826594}, publisher = {Schweizerbart}, author = {Engler, Adolf, 1844 -1930}, year = {1909}, pages = {Page 101}, } @book{bhlpg216023, title = {Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie }, volume = {Bd.44 (1910)}, url = {https://www.biodiversitylibrary.org/page/216023}, publisher = {Schweizerbart [etc.]}, author = {Engler, Adolf, 1844 -1930}, year = {1910}, pages = {Page 101}, } @book{bhlpg45742944, title = {Zwei pflanzengeographische Documente }, url = {https://www.biodiversitylibrary.org/page/45742944}, publisher = {}, author = {Drège, Jean François, 1794 -1881}, year = {1843}, pages = {Page 70}, }