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Publikováno v:
Yugoslav Journal of Operations Research, Vol 18, Iss 1, Pp 53-61 (2008)
This paper is a response for the paper of Dohi, Kaio and Osaki, that was published in RAIRO: Operations Research, 26, 1-14 (1992) for an EPQ model with present value. The purpose of this paper is threefold. First, the convex and increasing properties