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2. Applicability of Zeilberger's algorithm to rational functions;Abramov,2000
3. Proof of a conjecture of Wilf and Zeilberger, Preprint Series of the Institute of Mathematics;Abramov;Physics and Mechanics,2001
4. Canonical representations of hypergeometric terms;Abramov,2001
5. General hypergeometric systems of equations and series of hypergeometric type;Gel'fand;Uspekhi Mat. Nauk,1992