@article{1183509405, author = {Bobonis, Augusto}, title = {A sufficiency theorem for differential systems}, journal = {Bull. Amer. Math. Soc.}, volume = {52}, number = {12}, year = {1946}, pages = { 465-474}, language = {en}, url = {http://dml.mathdoc.fr/item/1183509405} }
Bobonis, Augusto. A sufficiency theorem for differential systems. Bull. Amer. Math. Soc., Tome 52 (1946) no. 12, pp. 465-474. http://gdmltest.u-ga.fr/item/1183509405/