MathSciNet bibliographic data MR701923 (84m:58136) 58G11 (34E05 35K05 46F10) Callias, Constantine J. The heat equation with singular coefficients. I. Operators of the form $-d\sp{2}/dx\sp{2}+\kappa /x\sp{2}$$-d\sp{2}/dx\sp{2}+\kappa /x\sp{2}$ in dimension $1$$1$. Comm. Math. Phys. 88 (1983), no. 3, 357–385. Article

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