@article{GDZPPN002349159, title = {Vari\'et\'es diff\'erentiables sans torsion.}, journal = {Mathematica Scandinavica}, volume = {20}, year = {1967}, pages = {190-194}, zbl = {0177.24401}, url = {http://dml.mathdoc.fr/item/GDZPPN002349159} }
Vranceanu, G. Variétés différentiables sans torsion.. Mathematica Scandinavica, Tome 20 (1967) pp. 190-194. http://gdmltest.u-ga.fr/item/GDZPPN002349159/