%0 Journal Article %A Lois Mansfield %T On the Variational Characterization and Convergence of Bivariate Splines. %J Numerische Mathematik %D 1972 %P 99-114 %V 20 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1972__20_132177/ %F NUMA_1972__20_132177