Umar, A.A. and Saaid, I.B.M. and Sulaimon, A.A. and Pilus, R.B.M. (2018) A review of petroleum emulsions and recent progress on water-in-crude oil emulsions stabilized by natural surfactants and solids. Journal of Petroleum Science and Engineering, 165. pp. 673-690. ISSN 09204105