@article{COCV_1998__3__49_0,
     author = {Petit, Philippe},
     title = {On the optimal control of implicit systems},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {49--81},
     publisher = {EDP-Sciences},
     volume = {3},
     year = {1998},
     mrnumber = {1610428},
     zbl = {0898.93009},
     language = {en},
     url = {http://www.numdam.org/item/COCV_1998__3__49_0/}
}