Mojtaba Mostafavi, S., et al. “Electrochemical Investigation of Thiophene on Glassy Carbon Electrode and Quantitative Determination of It in Simulated Oil Solution by Differential Pulse Voltammetry and Amperometry Techniques”. Asian Journal of Chemistry, vol. 23, no. 12, Sept. 2011, pp. 5356-60, https://asianpubs.org/index.php/ajchem/article/view/11151.