Ostojić, Jelena, et al. “Influence of Monomer Concentration on Capability of Voltammetric Polypyrrole Based Cation Sensor Using Modified Butler-Volmer Equation”. Bulletin of Chemists and Technologists of Bosnia and Herzegovina, vol. 40, June 2013, pp. 21-24, https://glashem.pmf.unsa.ba/index.php/bctbh/article/view/101.