Prescribing singularities for p-harmonic maps Bin ChenRobert Hardt Indiana University Mathematics Journal 1995 text pdf 10.1512/iumj.1995.44.2002 10.1512/iumj.1995.44.2002 en Indiana Univ. Math. J. 44 (1995) 575 - 602 state-of-the-art mathematics http://iumj.org/access/