Ouoba, Fabrice, Barro Diakarya, and Hay Yoba Talkibing. “Geostatistical Analysis With Copula-Based Models of Madograms, Correlograms and Variograms”. European Journal of Pure and Applied Mathematics 12, no. 3 (July 25, 2019): 1052–1068. Accessed December 5, 2022. https://www.ejpam.com/index.php/ejpam/article/view/3389.