TY - JOUR AU - Fatiha Boutaous TI - Fractional powers approach of operators for the solvability of some elliptic PDEʼs with variable operators coefficients JO - Comptes Rendus. Mathématique PY - 2011 SP - 969 EP - 972 VL - 349 IS - 17-18 PB - Elsevier DO - 10.1016/j.crma.2011.08.025 LA - en ID - CRMATH_2011__349_17-18_969_0 ER -