TY  - JOUR
AU  - Gião, António
TI  - Field equations of any differentiable variety
JO  - Portugaliae mathematica
PY  - 1958
SP  - 63
EP  - 83
VL  - 17
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1958__17_2_114802/
LA  - en
ID  - PORMA_1958__17_2_114802
ER  -