@article {MR2085243,
    AUTHOR = {G{\"o}pfert, A. and Tammer, Chr. and Z{\u{a}}linescu, C.},
     TITLE = {A new {ABB} theorem in normed vector spaces},
   JOURNAL = {Optimization},
  FJOURNAL = {Optimization. A Journal of Mathematical Programming and
              Operations Research},
    VOLUME = {53},
      YEAR = {2004},
    NUMBER = {4},
     PAGES = {369--376},
      ISSN = {0233-1934},
   MRCLASS = {90C29 (49J27 90C30 90C48)},
  MRNUMBER = {MR2085243 (2005e:90106)},
MRREVIEWER = {Phan Qu{\cfac{o}}c Kh{\'a}nh}, }