Approximation Theory: Proceedings of an International Conference held at Bonn, Germany, June 8-11, 1976 Lecture Notes in Mathematics, nr. 556 Editat de R. Schaback et al. noi 1976 Paperback Preț: 479.20 lei 6-8 săpt.
Praktische Mathematik II: Methoden der Analysis Hochschultext Autor H. Werner et al. dec 1978 Paperback Preț: 350.75 lei 6-8 săpt.