PARUNG, Joniarto; PRAYOGO, Dina Natalia. 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, [S.l.], v. 1, n. 1, p. 52-61, feb. 2008. ISSN 1979-0686. Available at: <http://journal.ubaya.ac.id/index.php/JLSCM/article/view/224>. Date accessed: 19 apr. 2019.