@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/}
}