Equilibrium Potentials and Additive Functionals Richard DuncanR. Getoor Indiana University Mathematics Journal 1972 text pdf 10.1512/iumj.1972.21.21042 10.1512/iumj.1972.21.21042 en Indiana Univ. Math. J. 21 (1972) 529 - 545 state-of-the-art mathematics http://iumj.org/access/