“Invariant and Preserving Transforms for Cross Ratio of 4-Points in a Line on Desargues Affine Plane”. Journal of Prime Research in Mathematics 20, no. 2 (December 31, 2024): 48 – 63. Accessed December 7, 2025. https://jprm.sms.edu.pk/index.php/jprm/article/view/231.