@book{bhlpg42270760, title = {Apex }, volume = {v.8 (1993)}, url = {https://www.biodiversitylibrary.org/page/42270760}, publisher = {La Société}, author = {Société belge de malacologie. }, year = {1993}, pages = {Page 79}, } @book{bhlpg42270773, title = {Apex }, volume = {v.8 (1993)}, url = {https://www.biodiversitylibrary.org/page/42270773}, publisher = {La Société}, author = {Société belge de malacologie. }, year = {1993}, pages = {Page 92}, }