@article{SMJ2_2003_29_4_a0,
     author = {Durea, M.},
     title = {Applications of the {Fr\'echet} subdifferential},
     journal = {Serdica Mathematical Journal},
     pages = {301--314},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2003_29_4_a0/}
}