@article {MR2801266,
    AUTHOR = {Voisei, M. D. and Z{\u{a}}linescu, C.},
     TITLE = {Some remarks concerning {G}ao-{S}trang's complementary gap
              function},
   JOURNAL = {Appl. Anal.},
  FJOURNAL = {Applicable Analysis. An International Journal},
    VOLUME = {90},
      YEAR = {2011},
    NUMBER = {6},
     PAGES = {1111--1121},
      ISSN = {0003-6811},
   MRCLASS = {49S05 (74S05 90C30)},
  MRNUMBER = {2801266},
       DOI = {10.1080/00036811.2010.483427},
       URL = {http://dx.doi.org/10.1080/00036811.2010.483427},
}