Seerwan Sulieman Noon. “Estimation the Variogram Function Indicator Which Represent the Transmissivity Coefficient in the Groundwater”. Tikrit Journal of Pure Science 25, no. 5 (December 18, 2020): 110–118. Accessed October 26, 2025. https://www.tjpsj.org/index.php/tjps/article/view/299.