Uniqueness of Energy Minimizing Maps for Almost All Smooth Boundary Data Libin Mou Indiana University Mathematics Journal 1991 text pdf 10.1512/iumj.1991.40.40020 10.1512/iumj.1991.40.40020 en Indiana Univ. Math. J. 40 (1991) 363 - 392 state-of-the-art mathematics http://iumj.org/access/