On perturbed Coulomb solutions of the Schrodinger equation Paul Koosis 30B4030C8532D1533C1534L2034L4081Q05Schroedinger equationCoulomb solutionsanalyticity and non-analyticitytheorem on 2 constantsanalytic continuation Indiana University Mathematics Journal 2002 text pdf 10.1512/iumj.2002.51.2120 10.1512/iumj.2002.51.2120 en Indiana Univ. Math. J. 51 (2002) 381 - 420 state-of-the-art mathematics http://iumj.org/access/