On uniqueness of heat flow of harmonic maps Tao HuangChangyou Wang Indiana University Mathematics Journal 2016 text pdf 10.1512/iumj.2016.65.5894 10.1512/iumj.2016.65.5894 en Indiana Univ. Math. J. 65 (2016) 1525 - 1546 state-of-the-art mathematics http://iumj.org/access/