“Using Fractional Factorial Experiments 2(5-1) in Complete Randomized Block Design to Study the Factors Affecting the Acidity of Yoghurt”. Review of International Geographical Education Online 11, no. 9 (November 15, 2021): 1008–1019. Accessed November 6, 2026. https://rigeo.org/index.php/rigeo/article/view/941.