Sharp Estimates for Jacobi Matrices and Chain Sequences. - Ryszard Szwarc (J. Approx. Theory, 2002)

Sharp estimates for Jacobi matrices and chain sequences, II. - Ryszard Szwarc (J. Approx. Theory, 2003)

Strictly positive definite functions in Rd. - Wolfgang zu Castell; Frank Filbir; Ryszard Szwarc (J. Approx. Theory, 2005)

Bounds on Turán determinants. - Christian Berg; Ryszard Szwarc (J. Approx. Theory, 2009)

On Axiomatization of Inconsistency Indicators for Pairwise Comparisons. - Waldemar W. Koczkodaj; Ryszard Szwarc (Fundam. Informaticae, 2014)

Positivity of Turán determinants for orthogonal polynomials II. - Ryszard Szwarc (J. Approx. Theory, 2021)

Dual spaces vs. Haar measures of polynomial hypergroups. - Stefan Kahler; Ryszard Szwarc (J. Approx. Theory, 2025)