Dr. Khalid L. A. El-Ashmawy, “Development of a Simple and Educational Softcopy Photogrammetric System”, ASRJETS-Journal, vol. 85, no. 1, pp. 235–248, Jan. 2022, Accessed: Sep. 13, 2025. [Online]. Available: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/7395