Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1981__40_3_115451, author = {Basto Gon\c{c}alves, J.}, title = {Equival\^encia de sistemas de gradiente}, journal = {Portugaliae mathematica}, pages = {263--277}, publisher = {mathdoc}, volume = {40}, number = {3}, year = {1981}, mrnumber = {0819891}, zbl = {0562.93042}, language = {es}, url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_3_115451/} }
Basto Gonçalves, J. Equivalência de sistemas de gradiente. Portugaliae mathematica, Tome 40 (1981) no. 3, pp. 263-277. http://geodesic.mathdoc.fr/item/PORMA_1981__40_3_115451/