Abstract

The title paper [Spectrochim. Acta A213 (2019): 391–396] reports an improvement of the ”Poor Man’s Kramers–Kronig analysis” and of the ”Kramers–Kronig constrained variational analysis” thanks to an ad hoc modification of some analytical formulas existing in the literature. This ad hoc modification is not based on mathematical grounds. In this comment we show that no ad hoc modification is required but a correction of the analytical formula used by the authors of the title paper [Spectrochim. Acta A213 (2019): 391–396].

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