@incollection {MR2742768,
    AUTHOR = {Hal{\'a}s, Miroslav and Kotta, {\"U}lle and Li, Ziming and
              Wang, Huaifu and Yuan, Chunming},
     TITLE = {Submersive rational difference systems and their
              accessibility},
 BOOKTITLE = {I{SSAC} 2009---{P}roceedings of the 2009 {I}nternational
              {S}ymposium on {S}ymbolic and {A}lgebraic {C}omputation},
     PAGES = {175--182},
 PUBLISHER = {ACM},
   ADDRESS = {New York},
      YEAR = {2009},
   MRCLASS = {93B27 (39A10 65Q10 93B15)},
  MRNUMBER = {2742768},
}