%0 Journal Article %A Ruas, Vitoriano %A Ghadi, Fattehallah %A Wakrim, Mohamed %T External approximation of $ H^{3}\mathrm{(\Omega )}$ in a bounded domain of $ \mathbb{R}^{3}$ with piecewise cubics of weak C2-class %J Comptes Rendus. Mathématique %D 2004 %P 969-974 %V 338 %N 12 %I Elsevier %U http://www.numdam.org/articles/10.1016/j.crma.2004.03.038/ %R 10.1016/j.crma.2004.03.038 %G en %F CRMATH_2004__338_12_969_0