@article{1102986270, author = {Kelley, Al}, title = {Invariance for linear systems of ordinary differential equations.}, journal = {Pacific J. Math.}, volume = {27}, number = {3}, year = {1968}, pages = { 289-304}, language = {en}, url = {http://dml.mathdoc.fr/item/1102986270} }
Kelley, Al. Invariance for linear systems of ordinary differential equations.. Pacific J. Math., Tome 27 (1968) no. 3, pp. 289-304. http://gdmltest.u-ga.fr/item/1102986270/