Matakova, Rema, and Gulzhan Badavamova. “Trace Electrochemical Analysis of Europium, Ytterbium, and Cerium at Their Joint Presence in Solution”. Chemical Bulletin of Kazakh National University, no. 1 (March 31, 2012): 127-132. Accessed June 26, 2019. https://bulletin.chemistry.kz/index.php/kaznu/article/view/343.