Ergodic Properties of Expectation Matrices of a Branching Process with Countably Many Types Shu-Teh Moy Indiana University Mathematics Journal 1967 text pdf 10.1512/iumj.1967.16.16079 10.1512/iumj.1967.16.16079 en Indiana Univ. Math. J. 16 (1967) 1207 - 1225 state-of-the-art mathematics http://iumj.org/access/