@book{bhlpg30070855, title = {Flora of the U.S.S.R }, volume = {v.21 (1977)}, url = {https://www.biodiversitylibrary.org/page/30070855}, publisher = {Israel Program for Scientific Translations}, author = {Botanicheskiĭ institut (Akademii︠a︡ nauk SSSR) }, year = {1977}, } @book{bhlpg30071232, title = {Flora of the U.S.S.R }, volume = {v.21 (1977)}, url = {https://www.biodiversitylibrary.org/page/30071232}, publisher = {Israel Program for Scientific Translations}, author = {Botanicheskiĭ institut (Akademii︠a︡ nauk SSSR) }, year = {1977}, pages = {Page 374}, }