@article{spigler:1999:lgo,
    author = {Spigler, Renato and Vianello, Marco and Locatelli, Francesca},
     title = {Liouville-{G}reen-{O}lver approximations for complex
              difference equations},
   journal = {J. Approx. Theory},
  fjournal = {Journal of Approximation Theory},
    volume = {96},
      year = {1999},
    number = {2},
     pages = {301–322},
      issn = {0021-9045},
     coden = {JAXTAZ},
   mrclass = {41A60 (39A10)},
  mrnumber = {MR1671200 (2000a:41050)},
mrreviewer = {Dumitru Acu},
       doi = {10.1006/jath.1998.3236},
     zblno = {0918.39002}}