Phuong, Hoang Thi, Phan Van Doan, and Trinh Thanh Son. “A Method for Analysis of Trace Carboxylate Surfactant in Oil Recovery Technology”. Petrovietnam Journal 40 (April 30, 2014): 61-64. Accessed April 17, 2026. http://www.pvj.com.vn/index.php/TCDK/article/view/562.