B. Saeed, A. Z. Khan, and H. Gul, “Physio-chemical Qualities of Wheat Varieties as Influenced by Nitrogen and Sulfur Fertilization”, Pak. J. Nutr., vol. 10, no. 11, pp. 1076–1082, Oct. 2011, doi: 10.3923/pjn.2011.1076.1082.