@article{1077474135,
author = {Doyle, Thomas C.},
title = {Tensor theory of invariants for the projective differential
geometry of a ruled surface},
journal = {Duke Math. J.},
volume = {14},
number = {1},
year = {1947},
pages = { 381-399},
language = {en},
url = {http://dml.mathdoc.fr/item/1077474135}
}
Doyle, Thomas C. Tensor theory of invariants for the projective differential
geometry of a ruled surface. Duke Math. J., Tome 14 (1947) no. 1, pp. 381-399. http://gdmltest.u-ga.fr/item/1077474135/