Pan, Yi, Shuangchun Yang, Shidong Wang, and Adewale Adebayo. 2016. “The Research of the Relationship Between Dialkyl Phosphate Ester Chain Length and the Oil Based Fracturing Fluid Viscosity”. Journal of the Serbian Chemical Society 81 (8). Belgrade, Serbia:935-45. https://doi.org/10.2298/JSC160114037L.