@article{JCA_1996_3_2_a2,
     author = {J.-P. Penot},
     title = {Subdifferential {Calculus} {Without} {Qualification} {Assumption}},
     journal = {Journal of convex analysis},
     pages = {207--22},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1996},
     url = {http://geodesic.mathdoc.fr/item/JCA_1996_3_2_a2/}
}