A Characterization of the Critical Catenoid Peter McGrath Indiana University Mathematics Journal 2018 text pdf 10.1512/iumj.2018.67.7251 10.1512/iumj.2018.67.7251 en Indiana Univ. Math. J. 67 (2018) 889 - 897 state-of-the-art mathematics http://iumj.org/access/