Mubarak, Shafaq, et al. “Comparative Study of Micronutrients in Soil and Plant Using Microwave Extraction in Wheat Fields of Lahore Suburbs, Pakistan”. Asian Journal of Chemistry, vol. 24, no. 5, Jan. 2012, pp. 2279-82, https://asianpubs.org/index.php/ajchem/article/view/8999.