On the Asymptotic Solution of a Nonlinear Dirichlet Problem Melvyn BergerL. Fraenkel Indiana University Mathematics Journal 1970 text pdf 10.1512/iumj.1970.19.19049 10.1512/iumj.1970.19.19049 en Indiana Univ. Math. J. 19 (1970) 553 - 585 state-of-the-art mathematics http://iumj.org/access/