“Ideal Purity and Absolute Purity in Modules”, J. Int. Acad. Phys. Sci., vol. 11, no. 1-4, pp. 99–106, Dec. 2007, Accessed: Oct. 23, 2026. [Online]. Available: http://www.iaps.org.in/journal/index.php/journaliaps/article/view/831