Moreton-Shabirin, Ainoon, and Hayder A Abdulbari. “Comparative Study on Viscosity and Drag Reducing Performance Between Hydroxypropyl Cellulose and Hydroxypropyl Cellulose-Surfactant Mixture”. International Journal of Engineering & Technology, vol. 7, no. 4, Mar. 2019, pp. 5120-6, https://doi.org/10.14419/ijet.v7i4.26017.