TY - JOUR AU - Jacob, N. AU - Knopova, V. TI - Fractional Derivatives and Fractional Powers as Tools in Understanding Wentzell Boundary Value Problems for Pseudo-Differential Operators Generating Markov Processes JO - Fractional calculus and applied analysis PY - 2005 SP - 91 EP - 112 VL - 8 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FCAA_2005_8_2_a0/ LA - en ID - FCAA_2005_8_2_a0 ER -