The Time-Dependent Solution for a Storage Model with Poisson Input J. GaniN. Prabhu Indiana University Mathematics Journal 1959 text pdf 10.1512/iumj.1959.8.58043 10.1512/iumj.1959.8.58043 en Indiana Univ. Math. J. 8 (1959) 653 - 663 state-of-the-art mathematics http://iumj.org/access/