Sample Functions of Stochastic Processes with Stationary Independent Increments R. BlumenthalR. Getoor Indiana University Mathematics Journal 1961 text pdf 10.1512/iumj.1961.10.10031 10.1512/iumj.1961.10.10031 en Indiana Univ. Math. J. 10 (1961) 493 - 516 state-of-the-art mathematics http://iumj.org/access/