Nguyen, Huu Truong, Wisup Bae, Thinh Nhan Hoang, and Cong Boi Phan. 2015. “Optimisation of Hydraulic Fracturing Design to Improve Oil Production from Oligocene Reservoirs by Maximising Net Present Value”. Petrovietnam Journal 12 (December), 28 - 37. https://pvj.vn/index.php/TCDK/article/view/742.