Martínez Martín, Erich, et al. “Factors Affecting the Stability of Crude and Transmission Oil Emulsion Swith Surfactant Solutions”. Revista Cubana De Ingeniería, vol. 7, no. 1, Apr. 2016, pp. 43-49, https://rci.cujae.edu.cu/index.php/rci/article/view/499.