@article{JCA_2004_11_2_JCA_2004_11_2_a8,
     author = {G. Carlier},
     title = {A {Necessary} and {Sufficient} {Optimality} {Condition} for a {Class} of {Nonconvex} {Scalar} {Variational} {Problems}},
     journal = {Journal of convex analysis},
     pages = {401--411},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/JCA_2004_11_2_JCA_2004_11_2_a8/}
}