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@article{MZ_1988__197_1_183738, author = {K. H\"ollig and C. de Boor}, title = {Approximation {Power} of {Smooth} {Bivariate} {PP} {Functions.}}, journal = {Mathematische Zeitschrift}, pages = {343--364}, publisher = {mathdoc}, volume = {197}, number = {1}, year = {1988}, zbl = {0616.41010}, url = {http://geodesic.mathdoc.fr/item/MZ_1988__197_1_183738/} }
K. Höllig; C. de Boor. Approximation Power of Smooth Bivariate PP Functions.. Mathematische Zeitschrift, Tome 197 (1988) no. 1, pp. 343-364. http://geodesic.mathdoc.fr/item/MZ_1988__197_1_183738/