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2. Abramov, S.A., Barkatou, M.A.: Rational solutions of first order linear difference systems. In: Proceedings of ISSAC'98, ACM Press, 1998
3. Abramov, S.A., Barkatou, M.A., van Hoeij, M.: Apparent Singularities of Linear Difference Equations with Polynomial Coefficients. To appear in AAECC, 2006
4. Abramov, S.A., Bronstein, M., Petkovšek, M.: On polynomial solutions of linear operator equations. In: Proceedings of ISSAC'95. ACM, New York, 1995
5. Abramov, S.A., Paule, P., Petkovšek, M.: q-Hypergeometric solutions of q-difference equations. In: Discrete Math. 180, 3–22 (1998)