@article{1077492256, author = {Thomas, Joseph Miller}, title = {Orderly differential systems}, journal = {Duke Math. J.}, volume = {6}, number = {1}, year = {1940}, pages = { 249-290}, language = {en}, url = {http://dml.mathdoc.fr/item/1077492256} }
Thomas, Joseph Miller. Orderly differential systems. Duke Math. J., Tome 6 (1940) no. 1, pp. 249-290. http://gdmltest.u-ga.fr/item/1077492256/