Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1941__2_1_114575, author = {Mira Fernandes, A. de}, title = {Um princ{\'\i}pio de velocidade m{\'\i}nima}, journal = {Portugaliae mathematica}, pages = {77--80}, publisher = {mathdoc}, volume = {2}, number = {1}, year = {1941}, mrnumber = {0004135}, zbl = {0025.11106}, language = {pt}, url = {http://geodesic.mathdoc.fr/item/PORMA_1941__2_1_114575/} }
Mira Fernandes, A. de. Um princípio de velocidade mínima. Portugaliae mathematica, Tome 2 (1941) no. 1, pp. 77-80. http://geodesic.mathdoc.fr/item/PORMA_1941__2_1_114575/