Voir la notice de l'article provenant de la source The Polish Digital Mathematics Library
@article{CC_2008_37_2_a3, author = {Dmitruk, Andrei V.}, title = {Jacobi type conditions for singular extremals}, journal = {Control and Cybernetics}, pages = {285--306}, publisher = {mathdoc}, volume = {37}, number = {2}, year = {2008}, zbl = {1235.49043}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CC_2008_37_2_a3/} }
Dmitruk, Andrei V. Jacobi type conditions for singular extremals. Control and Cybernetics, Tome 37 (2008) no. 2, pp. 285-306. http://geodesic.mathdoc.fr/item/CC_2008_37_2_a3/