Theory of Approximation by N. I. Achieser (1992, Trade Paperback)

Introduction to Approximation Theory

Approximation of Functions Theory and Numerical Methods by gunter Meinardus HC

Exact Constants in Approximation Theory

New Perspectives on Approximation and Sampling Theory: Festschrift in Honor of P

Grothendieck Spaces in Approximation Theory by Joerg Blatter

Brooks/Cole Ser. in Adv Math: Course in Approximation Theory by Cheney & Light

Optimal Estimation in Approximation Theory Hardcover