Cao Huu Binh, Bui Thieu Son, Phung Van Hai, Nguyen Huu Danh, Nguyen Vu Thien Tu, Vu Thi Xuan Huong, and Phan Thanh Loi. “Study of the Mechanical Properties of Oligocene Rocks in Cuu Long Basin for Optimisation of Oil Production Using Hydraulic Fracturing”. Petrovietnam Journal, Vol. 11, Nov. 2016, pp. 27 -34, doi:10.25073/petrovietnam journal.v11i0.287.