Splines and pseudo-inverses F. J. Delvos — 1978 ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique
Approximation properties of periodic interpolation by translates of one function F.-J. Delvos — 1994 ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique
Interpolation projectors and closed ideals F. J. Delvos; W. Schempp — 1989 Banach Center Publications