Volume Maximization in Semi-Riemannian Manifolds Jack Mealy Indiana University Mathematics Journal 1991 text pdf 10.1512/iumj.1991.40.40036 10.1512/iumj.1991.40.40036 en Indiana Univ. Math. J. 40 (1991) 793 - 814 state-of-the-art mathematics http://iumj.org/access/