A comprehensive study of a backlogging EOQ model with nonlinear heptagonal dense fuzzy environmentSuman Maity, Avishek Chakraborty, Sujit Kumar De, Sankar Prasad Mondal and Shariful AlamRAIRO-Oper. Res., 54 1 (2020) 267-286DOI: https://doi.org/10.1051/ro/2018114
