Dr. Shobha Lal. “PIGEON HOLE PRINCIPLE AND MATHEMATICAL INDUCTION CONTRACTION”. PalArch’s Journal of Archaeology of Egypt / Egyptology 17, no. 7 (November 1, 2020): 6060-6068. Accessed June 12, 2025. https://archives.palarch.nl/index.php/jae/article/view/2901.