1. Orthogonal expansions with positive coefficients;Askey;Proc. Amer. Math. Soc.,1965
2. Jacobi polynomial expansions with positive coefficients and imbeddings of projective spaces;Askey;Bull. Amer. Math. Soc.,1968
3. Linearization of the product of orthogonal polynomials;Askey,1970
4. Orthogonal polynomials and positivity, in Studies in Applied Mathematics;Askey,1970
5. Orthogonal expansions with positive coefficients. II;Askey;SIAM Jour. Math. Anal.,1971