Chahine, Iman, and Ahmad Morowah. “From Vortex Mathematics to Smith Numbers: Demystifying Number Structures and Establishing Sieves Using Digital Root”. Journal of Progressive Research in Mathematics 15, no. 3 (December 2, 2019): 2744-2757. Accessed May 5, 2024. http://www.scitecresearch.com/journals/index.php/jprm/article/view/1803.