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@article{NUMA_1973__21_132220, author = {Gregory M. Nielson}, title = {Bivariate {Spline} {Functions} and the {Approximation} of {Linear} {Functionals.}}, journal = {Numerische Mathematik}, pages = {138--160}, publisher = {mathdoc}, volume = {21}, year = {1973}, zbl = {0251.41004}, url = {http://geodesic.mathdoc.fr/item/NUMA_1973__21_132220/} }
Gregory M. Nielson. Bivariate Spline Functions and the Approximation of Linear Functionals.. Numerische Mathematik, Tome 21 (1973), pp. 138-160. http://geodesic.mathdoc.fr/item/NUMA_1973__21_132220/