On the existence of unique minimum for the cost function in a (Q,R) inventory model with backorders George E. Halkos, Ilias S. Kevork? and Christos N. Tziourtzioumis

On the existence of unique minimum for the cost function in a (Q,R) inventory model with backorders. IMA Journal of Management Mathematics, 29(1): 1-21, DOI: 10.1093/imaman/dpw010 (SCOPUS, ISI Listed. Impact factor: 1.529 and 5-year: 1.525). In common with I.S. Kevork and C.N. Tziourtzioumis (2018).

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inventory Control
Continuous review model
Hadley–Whitin approximation
cost function; unimodal distribution
convexity.
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