Oyagi, M.O., Onyatta, J.O., Kamau, G.N. and Guto, P.M. 2015. Simultaneous Determination of Trace Lead (II), Cadmium (II) and Cobalt (II) by Differential Pulse Anodic Stripping Voltammetry Using Polyacrylic acid/Glassy Carbon Electrode. International Journal of Sciences: Basic and Applied Research (IJSBAR). 23, 2 (Jul. 2015), 324–334.