@article {MR2284605,
    AUTHOR = {Ricceri, Biagio and Z{\u{a}}linescu, Constantin},
     TITLE = {A class of non-contractive operators with a unique fixed
              point},
   JOURNAL = {Fixed Point Theory},
  FJOURNAL = {Fixed Point Theory. An International Journal on Fixed Point
              Theory, Computation and Applications},
    VOLUME = {7},
      YEAR = {2006},
    NUMBER = {2},
     PAGES = {333--339},
      ISSN = {1583-5022},
   MRCLASS = {47H10},
  MRNUMBER = {MR2284605},
}