1. Balasz, K. and Kilgore, T. (1990) ‘Simultaneous approximation of derivatives’, Jour. Approx. Theory 60, 231–244.
2. Bojanic, R. (1971) ‘A note on the precision of interpolation by Hermite-Fejér polynomials’, Proceedings of the Conference on Constructive Theory of Functions, (Budapest), 69–76.
3. Bojanic, R., Varma, A.K. and Vértesi P. ‘Necessary and sufficient conditions for uniform convergence of quasi Hermite-and extended Hermite-Fejér interpolation’, Studia Sci. Math. Hungar. (to appear).
4. Criscuolo, G., Delia Vecchia, B. and Mastroianni, G. (1991) ‘Approximation by Extended Hermite-Fejér and Hermite interpolation’, to appear on Proceedings of Conference on Approximation Theory, Keckemet, Hungary.
5. Criscuolo, G., Delia Vecchia, B. and Mastroianni, G. (1990) ‘Approximation by Hermite-Fejér and Hermite Interpolation’, IAM Tec. Rep. n. 74/90, submitted.