%0 Journal Article
%A Namasivayam, S.
%A Ortiz, Eduardo L.
%T Best approximation and the numerical solution of partial differential equations with the tau method
%J Portugaliae mathematica
%D 1981
%P 97-119
%V 40
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1981__40_1_115442/
%G en
%F PORMA_1981__40_1_115442