1. Abramov, S.A.: Rational solutions of linear difference and q-difference equations with polynomial coefficients. Programming and Comput. Software (1995) 21, 273–278. (Translated from Programmirovanie (1995) 21, 3–11.)
2. Abramov, S.A., van Hoeij, M.: Desingularization of linear difference operators with polynomial coefficients. Proc. ISSAC'99, Vancouver (1999) pp. 269–275
3. Abramov, S.A., van Hoeij, M.: Set of poles of solutions of linear difference equations with polynomial coefficients. J. Comput. Math. Math. Phys. (2003) 43(1), 57–62 (Translated from Zhurnal Vychislitel'noi Matematiki i Matematicheskoi Fiziki (2003) 43(1), 60–65.)
4. Barkatou, M.A.: Contribution à l'étude des équations différentielles et aux différences dans le champ complexe, PhD Thesis (1989) INPG, Grenoble France
5. van Hoeij, M.: Formal solutions and factorization of differential operators with power series coefficients. J. Symb. Comput. 24, 1–30 (1997)