@book{bhlitem20625, title = {Mémoires de l'Académie royale des sciences, des lettres et des beaux-arts de Belgique }, volume = {t. 20 (1847)}, copyright = {Public domain. The BHL considers that this work is no longer under copyright protection.}, url = {https://www.biodiversitylibrary.org/item/20625}, note = {https://www.biodiversitylibrary.org/bibliography/104706}, publisher = {}, author = {Académie royale des sciences, des lettres et des beaux-arts de Belgique.}, year = {1847}, pages = {548}, }