Aiju, L., Honghai, W., Peiling, G. and Hong-zhi, X. (2013) “Chemical Fractionation Of Cu And Zn And Their Impacts On Microbial Properties In Slightly Contaminated Soils”, International Journal of Agricultural Research, Innovation and Technology, 3(1), pp. 20–25. doi: 10.3329/ijarit.v3i1.16045.