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3. A. Bultheel, P. Gonzalez-Vera, E. Hendriksen, O. Njåstad, May 1990, A Szegö Theory for Rational Functions, Department of Computer Science, K.U. Leuven
4. The computation of orthogonal rational functions and their interpolating properties;Bultheel;Numer. Algorithms,1992
5. Recurrence relations for orthogonal functions;Bultheel,1994