@article{JCA_2004_11_2_JCA_2004_11_2_a4,
     author = {G. Colombo and P. R. Wolenski},
     title = {Variational {Analysis} for a {Class} of {Minimal} {Time} {Functions} in {Hilbert} {Spaces}},
     journal = {Journal of convex analysis},
     pages = {335--361},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/JCA_2004_11_2_JCA_2004_11_2_a4/}
}