Parung, J., & Prayogo, D. (2008). Perancangan Model Optimasi Kerja Sama Single Supplier – Multi Buyers Melalui Quantity Flexibility Contract Untuk Memaksimumkan Total Supply Chain Profit. Journal Of Logistics & Supply Chain Management, 1(1), 52-61. Retrieved from http://journal.ubaya.ac.id/index.php/JLSCM/article/view/224