%0 Journal Article %A Fatiha Boutaous %T Fractional powers approach of operators for the solvability of some elliptic PDEʼs with variable operators coefficients %J Comptes Rendus. Mathématique %D 2011 %P 969-972 %V 349 %N 17-18 %I Elsevier %R 10.1016/j.crma.2011.08.025 %G en %F CRMATH_2011__349_17-18_969_0