Approximation Theory Using Positive Linear Operators
Approximation with Positive Linear Operators and Linear Combinations
Best Approximation in Normed Linear Spaces by Elements of Linear Subspaces
Pade Approximants for Operators: Theory and Applications (Lecture Notes in Mathematics, 1065)
Approximation of Functions of Several Variables and Imbedding Theorems (Grundlehren der mathematischen Wissenschaften)
Ordered Cones and Approximation
Mathematical Analysis, Approximation Theory and Their Applications
Convergence Estimates in Approximation Theory
Convex Analysis and Measurable Multifunctions (Lecture Notes in Mathematics, 580)
Schauder Bases in Banach Spaces of Continuous Functions (Lecture Notes in Mathematics, 918)