@article{RMC_1998_1998_1_a0,
     author = {Godefroy, Gilles},
     title = {Observaciones sobre el c\'alculo subdiferencial.},
     journal = {Revista matem\'atica complutense},
     pages = {269-279},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMC_1998_1998_1_a0/}
}