W. Schäfer, Walter Schempp. Error bounds for bivariate spline interpolation. In Walter Schempp, Karl Zeller, editors, Constructive Theory of Functions of Several Variables: Proceedings of a Conference Held at Oberwolfach, Germany, April 25 - May 1, 1976. Volume 571 of Lecture Notes in Mathematics, pages 196-211, Springer, 1976. [doi]
Abstract is missing.