1. [1] R. M. Blumenthal and R. K. Getoor, Markov processes and Potential Theory, Academic Press, New York, 1968.
2. [2] L. Carleson, Selected Problems on Exceptional Sets, Van Nostrand, Princeton, N. J., 1967.
3. [3] G. Choquet, Theory of capacities, Ann. Inst. Fourier, 5 (1953), 131-295.
4. [4] O. Frostman, Potentiel d'equilibre et capacity des ensembles avec quelques appli-cations a la theorise des fonctions, Medd. Lunds Univ. Mat. Sem., 3 (1935).
5. [5] N. Ikeda and S. Watanabe, On some relations between the harmonic measure and the Levy measure for a certain class of Markov processes, J. Kyoto Univ., 2-1 (1962), 79-95.