@article{MS2_1967__21_166018,
     author = {G. Vranceanu},
     title = {Vari\'et\'es diff\'erentiables sans torsion.},
     journal = {Mathematica Scandinavica},
     pages = {190--194},
     publisher = {mathdoc},
     volume = {21},
     year = {1967},
     zbl = {0177.24401},
     url = {http://geodesic.mathdoc.fr/item/MS2_1967__21_166018/}
}