Niyamosoth, Thanawath, Supachai Pathumnakul, and Sirikorn Prathumthip. 2016. “Production Lot Sizing Problem With Sudden Obsolescence and Machine Breakdowns”. Engineering and Applied Science Research 43 (November):504-8. https://ph01.tci-thaijo.org/index.php/easr/article/view/72628.