Mingxia, C., and Y. Zhishuo. “Relationship Between Fractal Dimension and Shear Strength of Vertisols and Red Earth”. Journal of Mines, Metals and Fuels, vol. 66, no. 9, Oct. 2022, pp. 642-5, https://www.informaticsjournals.com/index.php/jmmf/article/view/31775.