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 July 22, 2024. https://tjps.tu.edu.iq/index.php/tjps/article/view/299.