@article{COCV_2002__7__97_0,
     author = {Clarke, Francis H. and Rifford, Ludovic and Stern, R. J.},
     title = {Feedback in state constrained optimal control},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {97--133},
     publisher = {EDP-Sciences},
     volume = {7},
     year = {2002},
     doi = {10.1051/cocv:2002005},
     mrnumber = {1925023},
     zbl = {1033.49004},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/cocv:2002005/}
}