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April, 1969 Some perturbation theorems for nonnegative contraction semigroups*
Karl GUSTAFSON, Ken-iti SATO
J. Math. Soc. Japan 21(2): 200-204 (April, 1969). DOI: 10.2969/jmsj/02120200
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Vol.21 • No. 2 • April, 1969
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