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It is pointed out that some statements in a recent paper by Srinivas and Davies [1], concerning the validity of the so-called Mandel photon counting formula and its relation to another formula derived by the authors, are not correct. The former formula applies to an open system and the latter to a closed system, but conditions for the former are much more commonly encountered in practice.
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L. Mandeļ (1981) studied this question.
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