On Existence, Uniqueness and Convergence of Successive Approximations for Hyperbolic Partial Differential Equations Beatriz Margolis Indiana University Mathematics Journal 1970 text pdf 10.1512/iumj.1970.19.19027 10.1512/iumj.1970.19.19027 en Indiana Univ. Math. J. 19 (1970) 297 - 299 state-of-the-art mathematics http://iumj.org/access/