Orthonormal polynomials with exponential-type weights. - Hee Sun Jung; Ryozi Sakai (J. Approx. Theory, 2008)

The Markov-Bernstein inequality and Hermite-Fejér interpolation for exponential-type weights. - Hee Sun Jung; Ryozi Sakai (J. Approx. Theory, 2010)

Approximation by Lupas-Type Operators and Szász-Mirakyan-Type Operators. - Hee Sun Jung; Ryozi Sakai (J. Appl. Math., 2012)

Asymptotic Properties of Derivatives of the Stieltjes Polynomials. - Hee Sun Jung; Ryozi Sakai (J. Appl. Math., 2012)

Positive Interpolation Operators with Exponential-Type Weights. - Hee Sun Jung; Ryozi Sakai (J. Appl. Math., 2013)

Higher-Order Hermite-Fejér Interpolation for Stieltjes Polynomials. - Hee Sun Jung; Ryozi Sakai (J. Appl. Math., 2013)

Domain of convergence for a series of orthogonal polynomials. - Hee Sun Jung; Ryozi Sakai (J. Approx. Theory, 2015)

Lagrange interpolation polynomials for Laguerre-type weights. - Kentaro Itoh; Ryozi Sakai; Noriaki Suzuki (J. Approx. Theory, 2023)