@article{PPN266833020_0197+dmdlog31,
title = {Approximation Power of Smooth Bivariate PP Functions.},
journal = {Mathematische Zeitschrift},
volume = {199},
year = {1988},
pages = {343-364},
zbl = {0616.41010},
url = {http://dml.mathdoc.fr/item/PPN266833020_0197+dmdlog31}
}
Höllig, K.; Boor, C. de. Approximation Power of Smooth Bivariate PP Functions.. Mathematische Zeitschrift, Tome 199 (1988) pp. 343-364. http://gdmltest.u-ga.fr/item/PPN266833020_0197+dmdlog31/