Jangir, Abhishek, et al. “Phosphorus and Zinc Uptake and Protein, Lysine and Tryptophane Contents in Quality Protein Maize in Relation to Phosphorus and Zinc Fertilization in Mollisol”. Annals of Agricultural Research, vol. 36, no. 1, Feb. 2016, pp. 50-57, https://epubs.icar.org.in/index.php/AAR/article/view/54251.