MR1374427 G{\'e}rard, R. and Lutz, D. A. and Sch{\"a}fke, R. R. GÉRARD, D. A. LUTZ and R. SCHÄFKE Analytic reduction of some nonlinear difference equations Funkcialaj Ekvacioj. Serio Internacia 38 1995 381--410 http://fe.math.kobe-u.ac.jp/FE/Free/vol38/fe38-3-2.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE35-40-en_KML/fe38-381-410/fe38-381-410.pdf http://www.ams.org/mathscinet-getitem?mr=MR1374427 fe38-381-410 1995 Analytic Reduction of Some Nonlinear Difference Equations G\'ERARD, R.; LUTZ, D. A.; SCH\"AFKE, R. G\'ERARD, R.; LUTZ, D. A.; SCH\"AFKE, R.
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