@article {MR1811680,
    AUTHOR = {Penot, Jean-Paul and Z{\u{a}}linescu, Constantin},
     TITLE = {Elements of quasiconvex subdifferential calculus},
   JOURNAL = {J. Convex Anal.},
  FJOURNAL = {Journal of Convex Analysis},
    VOLUME = {7},
      YEAR = {2000},
    NUMBER = {2},
     PAGES = {243--269},
      ISSN = {0944-6532},
   MRCLASS = {49J52 (26A51 26B25)},
  MRNUMBER = {MR1811680 (2002b:49028)},
MRREVIEWER = {Xin Min Yang},
}