Das Anfangswertproblem der Statistischen Mechanik Rudolf Kurth Indiana University Mathematics Journal 1958 text pdf 10.1512/iumj.1958.7.57003 10.1512/iumj.1958.7.57003 en Indiana Univ. Math. J. 7 (1958) 29 - 41 state-of-the-art mathematics http://iumj.org/access/