@article{1102994510, author = {Johnson, H. H.}, title = {An algebraic approach to exterior differential systems.}, journal = {Pacific J. Math.}, volume = {19}, number = {3}, year = {1966}, pages = { 423-434}, language = {en}, url = {http://dml.mathdoc.fr/item/1102994510} }
Johnson, H. H. An algebraic approach to exterior differential systems.. Pacific J. Math., Tome 19 (1966) no. 3, pp. 423-434. http://gdmltest.u-ga.fr/item/1102994510/