Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1958__17_2_114802, author = {Gi\~ao, Ant\'onio}, title = {Field equations of any differentiable variety}, journal = {Portugaliae mathematica}, pages = {63--83}, publisher = {mathdoc}, volume = {17}, number = {2}, year = {1958}, mrnumber = {0103757}, zbl = {0087.22602}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1958__17_2_114802/} }
Gião, António. Field equations of any differentiable variety. Portugaliae mathematica, Tome 17 (1958) no. 2, pp. 63-83. http://geodesic.mathdoc.fr/item/PORMA_1958__17_2_114802/