@article{CC_2008_37_2_a11,
     author = {Poggiolini, Laura and Stefani, Gianna},
     title = {Sufficient optimality conditions for a bang--singular extremal in the minimum time problem},
     journal = {Control and Cybernetics},
     pages = {469--490},
     publisher = {mathdoc},
     volume = {37},
     number = {2},
     year = {2008},
     zbl = {1235.49054},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2008_37_2_a11/}
}