“Invariant and Preserving Transforms for Cross Ratio of 4-Points in a line on Desargues Affine Plane”, JPRM, vol. 20, no. 2, pp. 48 – 63, Dec. 2024, Accessed: Dec. 07, 2025. [Online]. Available: https://jprm.sms.edu.pk/index.php/jprm/article/view/231