@article{2312, author = {Gi\~ao, Ant\'onio}, title = {Field equations of any differentiable variety}, journal = {Portugaliae mathematica}, volume = {17}, year = {1958}, pages = {63-83}, zbl = {0087.22602}, mrnumber = {0103757}, language = {en}, url = {http://dml.mathdoc.fr/item/2312} }
Gião, António. Field equations of any differentiable variety. Portugaliae mathematica, Tome 17 (1958) pp. 63-83. http://gdmltest.u-ga.fr/item/2312/