@book {MR1994718,
    AUTHOR = {G{\"o}pfert, Alfred and Riahi, Hassan and Tammer, Christiane
              and Z{\u{a}}linescu, Constantin},
     TITLE = {Variational methods in partially ordered spaces},
    SERIES = {CMS Books in Mathematics/Ouvrages de Math\'ematiques de la
              SMC, 17},
 PUBLISHER = {Springer-Verlag},
   ADDRESS = {New York},
      YEAR = {2003},
     PAGES = {xiv+350},
      ISBN = {0-387-00452-1},
   MRCLASS = {90-02 (46N10 90C29 90C48)},
  MRNUMBER = {MR1994718 (2004h:90001)},
MRREVIEWER = {George Isac}, }