Free Convolution of Measures with Unbounded Support Hari BercoviciDan Voiculescu Indiana University Mathematics Journal 1993 text pdf 10.1512/iumj.1993.42.42033 10.1512/iumj.1993.42.42033 en Indiana Univ. Math. J. 42 (1993) 733 - 773 state-of-the-art mathematics http://iumj.org/access/