@article{GDZPPN001184121,
title = {On the Dimension of Bivariate Spline Spaces of Smoothness r and Degree d = 3r + 1.},
journal = {Numerische Mathematik},
volume = {58},
year = {1990},
pages = {651-662},
zbl = {0725.41012},
url = {http://dml.mathdoc.fr/item/GDZPPN001184121}
}
Schumaker, Larry L.; Alfeld, Peter. On the Dimension of Bivariate Spline Spaces of Smoothness r and Degree d = 3r + 1.. Numerische Mathematik, Tome 58 (1990) pp. 651-662. http://gdmltest.u-ga.fr/item/GDZPPN001184121/