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2. Orthogonal polynomials on the disc;Boyd,1972
3. Spherical functions on a semisimple Lie group, I;Harish-Chandra;Amer. J. Math.,1958
4. Plane algebraic curves;Hilton,1932
5. The addition formula for Jacobi polynomials, II, The Laplace type integral representation and the product formula;Koornwinder,1972