MathSciNet bibliographic data MR470750 47D05 (35P99 81.47) Herbst, Ira W.; Sloan, Alan D. Perturbation of translation invariant positivity preserving semigroups on $L\sp{2}({\bf R}\sp{N})$$L\sp{2}({\bf R}\sp{N})$. Trans. Amer. Math. Soc. 236 (1978), 325–360. Article

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