Central Limit Theorems for Certain Infinite Urn Schemes Samuel Karlin Indiana University Mathematics Journal 1968 text pdf 10.1512/iumj.1968.17.17020 10.1512/iumj.1968.17.17020 en Indiana Univ. Math. J. 17 (1968) 373 - 401 state-of-the-art mathematics http://iumj.org/access/