@article{CC_2009_38_4A_a11,
     author = {Clarke, Francis H. and do Rosario de Pinho, Maria},
     title = {The nonsmooth maximum principle},
     journal = {Control and Cybernetics},
     pages = {1151--1167},
     publisher = {mathdoc},
     volume = {38},
     number = {4A},
     year = {2009},
     zbl = {1236.49048},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2009_38_4A_a11/}
}