A., H. D., S. O. N., and T. A. T. “Comparative Analysis of Euclid and Lobachevsky Geometries”. American Journal of Engineering , Mechanics and Architecture (2993-2637), vol. 2, no. 4, Apr. 2024, pp. 114-6, http://grnjournal.us/index.php/AJEMA/article/view/4363.