Nawaz, Rab, et al. “Leaching Losses of Nutrient Cations (K+, Ca2+ and Mg2+) from Oxisol and Ultisol Under Different Rates of Acidic Deposition in Thailand”. Asian Journal of Chemistry, vol. 27, no. 6, Mar. 2015, pp. 2195-9, doi:10.14233/ajchem.2015.18072.