Hulls of Surfaces Alexander IzzoE. Stout Indiana University Mathematics Journal 2018 text pdf 10.1512/iumj.2018.67.6250 10.1512/iumj.2018.67.6250 en Indiana Univ. Math. J. 67 (2018) 2061 - 2087 state-of-the-art mathematics http://iumj.org/access/