Fracture of Brittle Solids by Applied Loads T. Thomas Indiana University Mathematics Journal 1970 text pdf 10.1512/iumj.1970.19.19036 10.1512/iumj.1970.19.19036 en Indiana Univ. Math. J. 19 (1970) 379 - 402 state-of-the-art mathematics http://iumj.org/access/