@article{JCA_2002_9_1_JCA_2002_9_1_a4,
     author = {B. Jim\'enez and V. Novo},
     title = {Alternative {Theorems} and {Necessary} {Optimality} {Conditions} for {Directionally} {Differentiable} {Multiobjective} {Programs}},
     journal = {Journal of convex analysis},
     pages = {97--116},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/JCA_2002_9_1_JCA_2002_9_1_a4/}
}