@article{ASNSP_1974_4_1_3-4_229_0, author = {Slemrod, Marshall}, title = {Existence of optimal controls for control systems governed by nonlinear partial differential equations}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {229--246}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 1}, number = {3-4}, year = {1974}, mrnumber = {380560}, zbl = {0314.49007}, language = {en}, url = {http://archive.numdam.org/item/ASNSP_1974_4_1_3-4_229_0/} }