MathSciNet bibliographic data MR436854 82.47 Herbst, Ira W. Spectral theory of the operator \$(p\sp{2}+m\sp{2})\sp{1/2}-Ze\sp{2}/r\$$(p\sp{2}+m\sp{2})\sp{1/2}-Ze\sp{2}/r$. Comm. Math. Phys. 53 (1977), no. 3, 285–294. Article

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