List of Articles Optimal Open Access Article Abstract Page Full-Text 1 - Optimal ordering quantities for substitutable deteriorating items under joint replenishment with cost of substitution Vinod Kumar Mishra Open Access Article Abstract Page Full-Text 2 - Stochastic cooperative advertising in a manufacturer–retailer decentralized supply channel Peter E. Ezimadu Chukwuma R. Nwozo Open Access Article Abstract Page Full-Text 3 - Modified FGP approach and MATLAB program for solving multi-level linear fractional programming problems Kailash Lachhwani Suresh Nehra Open Access Article Abstract Page Full-Text 4 - A goal geometric programming problem (G2P2) with logarithmic deviational variables and its applications on two industrial problems Payel Ghosh Tapan Kumar Roy Open Access Article Abstract Page Full-Text 5 - Shrinkage simplex-centroid designs for a quadratic mixture model Davood Shishebori Abolghasem Yousefi Babadi Taha Hasan Sajid Ali Munir Ahmed Open Access Article Abstract Page Full-Text 6 - Policy options for value added to different levels of production C.O Anyaeche Open Access Article Abstract Page Full-Text 7 - Funding decisions Fatemeh Farhad M Farbod SH Amini Open Access Article Abstract Page Full-Text 8 - Optimal overhaul–replacement policy for a multi-degraded repairable system sold with warranty Kusmaningrum Soemadi Bermawi Priyatna Iskandar Harsono Taroepratjeka 20.1001.1.17355702.2020.16.3.5.2 Open Access Article Abstract Page Full-Text 9 - Robust uncapacitated multiple allocation hub location problem under demand uncertainty: minimization of cost deviations Aleksejs Lozkins Mikhail Krasilnikov Vladimir Bure 20.1001.1.17355702.2020.16.3.8.5