@article{1077476768,
author = {Bell, P. O.},
title = {Projective differential invariants of a curve of a surface},
journal = {Duke Math. J.},
volume = {18},
number = {1},
year = {1951},
pages = { 697-705},
language = {en},
url = {http://dml.mathdoc.fr/item/1077476768}
}
Bell, P. O. Projective differential invariants of a curve of a surface. Duke Math. J., Tome 18 (1951) no. 1, pp. 697-705. http://gdmltest.u-ga.fr/item/1077476768/