Optimal maintenance service contract involving discrete preventive maintenance using principal agent theory. - Eka K. A. Pakpahan; Bermawi P. Iskandar (IEEM, 2015)

Simultaneous Assignment and Pricing for Multi-Objective Online Ride-Hailing Problem Model. - Eka Kurnia Asih Pakpahan; Andi Cakravastia; Anas Ma'ruf; Bermawi Priyatna Iskandar (MSIE, 2021)