Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1941__2_1_114585, author = {Mira Fernandes, A. de}, title = {Sistema derivato di un sistema dinamico}, journal = {Portugaliae mathematica}, pages = {162--165}, publisher = {mathdoc}, volume = {2}, number = {1}, year = {1941}, mrnumber = {0004540}, zbl = {0025.11201}, language = {it}, url = {http://geodesic.mathdoc.fr/item/PORMA_1941__2_1_114585/} }
Mira Fernandes, A. de. Sistema derivato di un sistema dinamico. Portugaliae mathematica, Tome 2 (1941) no. 1, pp. 162-165. http://geodesic.mathdoc.fr/item/PORMA_1941__2_1_114585/