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@article{PORMA_2004__61_1_50862, author = {Torres, Delfim F.M.}, title = {Quasi-invariant optimal control problems.}, journal = {Portugaliae mathematica}, pages = {97--114}, publisher = {mathdoc}, volume = {61}, number = {1}, year = {2004}, zbl = {1042.49015}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_2004__61_1_50862/} }
Torres, Delfim F.M. Quasi-invariant optimal control problems.. Portugaliae mathematica, Tome 61 (2004) no. 1, pp. 97-114. http://geodesic.mathdoc.fr/item/PORMA_2004__61_1_50862/