On the Polynomial Hull of a Graph N. Shcherbina Indiana University Mathematics Journal 1993 text pdf 10.1512/iumj.1993.42.42022 10.1512/iumj.1993.42.42022 en Indiana Univ. Math. J. 42 (1993) 477 - 503 state-of-the-art mathematics http://iumj.org/access/