N. Chernyavskaya et L. Shuster, ESTIMATES FOR GREENS-FUNCTION OF THE STURM-LIOUVILLE OPERATOR, Journal of differential equations, 111(2), 1994, pp. 410-420
The Sturm-Liouville operator on the axis is considered. Efficient two-
sided estimates for Green's function sharp by order on the diagonal ar
e obtained under the minimal requirements on a potential. (C) 1994 Aca
demic Press, Inc.