Kesava Menon, P. “On Vaidyanathaswamy’s Class Division of the Residue Classes Modulo ’N’”. The Journal of the Indian Mathematical Society 26, no. 3-4 (September 1, 1961): 167–186. Accessed July 18, 2024. https://informaticsjournals.com/index.php/jims/article/view/16888.