Camovska, Dragica B., Martin Lj. Arsov, and Toma P. Grcev. 2007. “Electrochemical and Impedance Characterization of Passive Films on Niobium in Alkaline and Acidic Solutions”. Macedonian Journal of Chemistry and Chemical Engineering 26 (2):95-101. https://doi.org/10.20450/mjcce.2007.263.