Mittal, R., U. Bhargawa, S. Anand, and S. C. Vir. “Zinc Status of Indian Pregnant Women of Low Income Group and Its Effect on Outcome of Pregnancy”. The Indian Journal of Nutrition and Dietetics, vol. 19, no. 4, Apr. 1982, pp. 117-24, http://informaticsjournals.com/index.php/ijnd/article/view/12939.