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Sharma, Usha; Urvashi; Singhal, Surbhi Optimal pricing and ordering policy of retailers with variable holding cost under delay in payments. (English) Zbl 1220.90019 Int. Trans. Math. Sci. Comput. 2, No. 1, 177-184 (2009). MSC: 90B05 PDFBibTeX XMLCite \textit{U. Sharma} et al., Int. Trans. Math. Sci. Comput. 2, No. 1, 177--184 (2009; Zbl 1220.90019)