Ashetu, T.T., et al. “Determination of Heavy Metals (Ag+, Cd2+ and Pb2+) Using FAAS and ISE in Soil Samples of Selected Eastern Hararghe Area”. International Journal of Scientific Research in Chemical Sciences, vol. 9, no. 1, Feb. 2022, pp. 6-12, https://ijsrcs.isroset.org/index.php/j/article/view/108.