A Model of Dislocations and the Associated Free Boundary Problem Luis CaffarelliAvner Friedman Indiana University Mathematics Journal 1988 text pdf 10.1512/iumj.1988.37.37024 10.1512/iumj.1988.37.37024 en Indiana Univ. Math. J. 37 (1988) 451 - 479 state-of-the-art mathematics http://iumj.org/access/