Sz. Levendorskii, SPECTRAL ASYMPTOTICS WITH A REMAINDER ESTIMATE FOR SCHRODINGER-OPERATORS WITH SLOWLY GROWING POTENTIALS, Proceedings of the Royal Society of Edinburgh. Section A. Mathematics, 126, 1996, pp. 829-836
We compute the principal term of the asymptotics with a remainder esti
mate for Schrodinger operators with slowly growing potentials q, a typ
ical example being q(x) = ln...ln \x\ outside some compact.