MoonGil Yoon, DukYoung Yoon, Sangheon Han. A DUAL BASED HEURISTIC FOR A HUB-SPOKE AIR CARGO NETWORK DESIGN PROBLEM WITH HOP-COUNT CONSTRAINTS. Journal of Scientiae Mathematicae Japonicae. 2006. e. 2006. 475-488
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Sangheon Han, Hirotaka Matsumoto. A Periodic review Supply Chain Inventory Model. NUCB Journal of Economics and Information Science. 2006. 50. 2. 125-136
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