@article{1183534978,
author = {Burchard, Hermann G.},
title = {Extremal positive splines with applications to interpolation and approximation by generalized convex functions},
journal = {Bull. Amer. Math. Soc.},
volume = {79},
number = {5},
year = {1973},
pages = { 959-963},
language = {en},
url = {http://dml.mathdoc.fr/item/1183534978}
}
Burchard, Hermann G. Extremal positive splines with applications to interpolation and approximation by generalized convex functions. Bull. Amer. Math. Soc., Tome 79 (1973) no. 5, pp. 959-963. http://gdmltest.u-ga.fr/item/1183534978/