@article{05309257, title = {Relative differential }, journal = {SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]}, volume = {4}, year = {2008}, doi = {10.3842/SIGMA.2008.035}, zbl = {1152.51004}, language = {en}, url = {http://dml.mathdoc.fr/item/05309257} }
Maghfoul, Mohamed. Relative differential . SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 4 (2008) . doi : 10.3842/SIGMA.2008.035. http://gdmltest.u-ga.fr/item/05309257/