@article{AIHPC_1989__S6__305_0,
     author = {Gauvin, J. and Janin, R.},
     title = {Directional lipschitzian optimal solutions and directional derivative for the optimal value function in nonlinear mathematical programming},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {305--324},
     publisher = {Gauthier-Villars},
     volume = {S6},
     year = {1989},
     mrnumber = {1019119},
     zbl = {0675.90078},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1989__S6__305_0/}
}