@article{01014814,
title = {The viscosity subdifferential of the sum of two functions in Banach spaces. I: First order case.},
journal = {Journal of Convex Analysis},
volume = {3},
year = {1996},
pages = {295-308},
zbl = {0935.49011},
language = {en},
url = {http://dml.mathdoc.fr/item/01014814}
}
El Haddad, E.; Deville, R. The viscosity subdifferential of the sum of two functions in Banach spaces. I: First order case.. Journal of Convex Analysis, Tome 3 (1996) pp. 295-308. http://gdmltest.u-ga.fr/item/01014814/