@article{JCA_2002_9_2_JCA_2002_9_2_a11,
     author = {F. Jules and M. Lassonde},
     title = {Formulas for {Subdifferentials} of {Sums} of {Convex} {Functions}},
     journal = {Journal of convex analysis},
     pages = {519--533},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/JCA_2002_9_2_JCA_2002_9_2_a11/}
}