@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://www.numdam.org/item/ASNSP_1974_4_1_3-4_229_0/}
}