A Method for Computing Non-Parametric Area Minimizing Surfaces over n Dimensional Domains, Together with a Priori Error Estimates Harold Parks Indiana University Mathematics Journal 1977 text pdf 10.1512/iumj.1977.26.26050 10.1512/iumj.1977.26.26050 en Indiana Univ. Math. J. 26 (1977) 625 - 643 state-of-the-art mathematics http://iumj.org/access/