U. C. Dhar, B. Sarker, A. S. Rahman, S. T. Siddika, and T. T. Progga, “Effect of Cigarette Smoking on Serum Homocysteine and Vitamin B12 Levels in Apparently Healthy Male Smokers”, Mugda Med. Coll. J., vol. 8, no. 2, pp. 101–106, Dec. 2025.