Guo, C.Z., C.G. Chen, Z.L. Luo, and A.D. Zhao. 2012. “Direct Electrochemical Detection of Trace Porcine Insulin on Carbon Paste Electrode With Modified Graphite Powder”. Asian Journal of Chemistry 24 (8):3665-70. https://asianpubs.org/index.php/ajchem/article/view/9418.