@article {MR2448918,
    AUTHOR = {Hantoute, A. and L{\'o}pez, M. A. and Z{\u{a}}linescu, C.},
     TITLE = {Subdifferential calculus rules in convex analysis: a unifying
              approach via pointwise supremum functions},
   JOURNAL = {SIAM J. Optim.},
  FJOURNAL = {SIAM Journal on Optimization},
    VOLUME = {19},
      YEAR = {2008},
    NUMBER = {2},
     PAGES = {863--882},
      ISSN = {1052-6234},
   MRCLASS = {90C25 (46G05 46N10 49J52)},
  MRNUMBER = {MR2448918},
}