@book{bhlpg31092950, title = {Historia naturalis bulgarica }, volume = {v.7 (1997)}, url = {https://www.biodiversitylibrary.org/page/31092950}, publisher = {Bulgarska akademiia na naukite}, author = {Bŭlgarska akademii︠a︡ na naukite. }, year = {1997}, pages = {Page 25}, }