P. . Traiwiriyawong and S. Kungsanant, “Potential of Palm Kernel Alkanolamide Surfactant for Enhancing Oil Recovery from Sandstone Reservoir Rocks: DOI: 10.32526/ennrj.18.4.2020.32”, Environ. Nat. Resour. J., vol. 18, no. 4, pp. 333–344, Jul. 2020.