Le Vu Quan, Vu Duc Ung, Pham Hong Trang, Le Thi Thu Huong, Nguyen Manh Tuan, and Do Huu Trung. “Some Solutions to Improve the Cement Bond Quality for Carbonate Zones in Block 05-1a, Offshore Vietnam”. Petrovietnam Journal, Vol. 10, Oct. 2016, pp. 24 -31, http://www.pvj.com.vn/index.php/TCDK/article/view/346.