S. . Rai, R. . Kumar, and D. . Khatri, “Innovative Heavy Metal Waste Disposal System: Modular Approach for Senior Secondary Chemistry Teachers”, SS, vol. 55, no. 2-3, pp. p.133–135, Sep. 2017, Accessed: Dec. 31, 2025. [Online]. Available: https://ejournals.ncert.gov.in/index.php/SS/article/view/2547