@article {MR2426569,
    AUTHOR = {Feng, Ruyong and Gao, Xiao-Shan and Huang, Zhenyu},
     TITLE = {Rational solutions of ordinary difference equations},
   JOURNAL = {J. Symbolic Comput.},
  FJOURNAL = {Journal of Symbolic Computation},
    VOLUME = {43},
      YEAR = {2008},
    NUMBER = {10},
     PAGES = {746--763},
      ISSN = {0747-7171},
   MRCLASS = {39-04 (39A10 68W30)},
  MRNUMBER = {2426569 (2009f:39001)},
       DOI = {10.1016/j.jsc.2008.03.001},
       URL = {http://dx.doi.org/10.1016/j.jsc.2008.03.001},
}