| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Approximation of Functions and Operators | 978-0-8218-3038-3 | 1977 | S. B. Stechkin |
| Approximation of Functions in the Mean: Proceedings | 978-0-8218-1888-6 | 1969 | |
| Approximation of Periodic Function: Proceedings | 978-0-8218-3009-3 | 1974 | |
| Sequences of Convergence for Series: Proceedings | 978-0-8218-1886-2 | 1967 | P. I. Ul'Janov |