P. Paunović, O. Popovski, D. Stoevska Gogovska, E. Lefterova, E. Slavcheva, and A. T. Dimitrov, “Electrocatalytic activity of hypo–hyper-d-electrocatalysts (Me/TiO₂/MWCNTs) based on Co-Ru in alkaline hydrogen electrolyser”, Maced. J. Chem. Chem. Eng., vol. 30, no. 1, pp. 55–65, Jun. 2011.