@article{GDZPPN001171178,
title = {Bivariate Spline Functions and the Approximation of Linear Functionals.},
journal = {Numerische Mathematik},
volume = {21},
year = {1973},
pages = {138-160},
zbl = {0251.41004},
url = {http://dml.mathdoc.fr/item/GDZPPN001171178}
}
Nielson, Gregory M. Bivariate Spline Functions and the Approximation of Linear Functionals.. Numerische Mathematik, Tome 21 (1973) pp. 138-160. http://gdmltest.u-ga.fr/item/GDZPPN001171178/