@article{BSMF_1910__38__211_0, author = {Perrin, R.}, title = {Sur les halph\'eniennes ou expressions diff\'erentielles qu'annule l'op\'erateur caract\'eristique des covariants}, journal = {Bulletin de la Soci\'et\'e Math\'ematique de France}, pages = {211--238}, publisher = {Soci\'et\'e math\'ematique de France}, volume = {38}, year = {1910}, doi = {10.24033/bsmf.860}, language = {fr}, url = {http://www.numdam.org/articles/10.24033/bsmf.860/} }