Hassan, M. M.- ul-., and P. . J. Gregory. “The Role of Rainfall Intensity and Soil in Determining Rates of Flow Through Cryoturbated Chalk”. Biological Sciences - PJSIR, vol. 51, no. 5, Sept. 2008, pp. 235-41, https://v2.pjsir.org/index.php/biological-sciences/article/view/677.