Complex Monge-Ampere equations with a countable number of singular points Yang Xing Indiana University Mathematics Journal 1999 text pdf 10.1512/iumj.1999.48.1663 10.1512/iumj.1999.48.1663 en Indiana Univ. Math. J. 48 (1999) 749 - 766 state-of-the-art mathematics http://iumj.org/access/