Positive Solutions of Semilinear Schroedinger Equations in Exterior Domains Ezzat NoussairC. Swanson Indiana University Mathematics Journal 1979 text pdf 10.1512/iumj.1979.28.28072 10.1512/iumj.1979.28.28072 en Indiana Univ. Math. J. 28 (1979) 993 - 1003 state-of-the-art mathematics http://iumj.org/access/