M. Yousaf, S. Ali, M. Waheed, and M. S. Akhtar, “Dynamics of Clay Mineralogy With Profile Depth in Relation to Long Term Potassium Fertilizer Application to Sugar Cane Crop: Clay Mineralogy in Relation to K-Fertilizer Application to Sugar Can”, Pakistan Journal of Scientific & Industrial Research, vol. 52, no. 1, pp. 32–36, Feb. 2009.