1. G. D. Birkhoff and W. J. Trjitzinsky, “Analytic theory of singular difference equations,”Acta Math.,60, 1–89 (1932).
2. W. A. Harris Jr. and Y. Sibuya, “General solution of nonlinear difference equations,”Trans. Amer. Math. Soc.,115, 62–75 (1965).
3. By. K. Takano, “General solution of a nonlinear difference equation of Briot-Bouquet type,”Funkc. Ekvacioj.,13, No. 3, 179–198 (1971).
4. By. K. Takano, “Solution containing arbitrary periodic functions of systems of nonlinear difference equations,”Funck. Ekvacioj.,13, No. 2, 137–164 (1973).
5. G. P. Pelyukh, “Structure of continuous solutions of one class of nonlinear difference equations,”Differents. Uravn.,30, No. 6, 1083–1085 (1994).