A Weighted Inequality and Eigenvalue Estimates for Schroedinger Operators Eric Sawyer Indiana University Mathematics Journal 1986 text pdf 10.1512/iumj.1986.35.35001 10.1512/iumj.1986.35.35001 en Indiana Univ. Math. J. 35 (1986) 1 - 28 state-of-the-art mathematics http://iumj.org/access/