The Necessity of the Wiener Test for Some Semi-Linear Elliptic Equations David AdamsAnn Heard Indiana University Mathematics Journal 1992 text pdf 10.1512/iumj.1992.41.41007 10.1512/iumj.1992.41.41007 en Indiana Univ. Math. J. 41 (1992) 109 - 124 state-of-the-art mathematics http://iumj.org/access/