Sinigersky, Vesselin, Ublekov, Filip, Penchev, Hristo, Radev, Ivan, Georgiev, Vassil. "POLYBENZIMIDAZOLE BASED COMPOSITE PROTON AND ANION CONDUCTIVE MEMBRANES FOR PEM FUEL CELLS AND ELECTROLYZER CELLS." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 15th International Multidisciplinary Scientific GeoConference SGEM2015, ENERGY AND CLEAN TECHNOLOGIES, 2015, pp. 358-392. https://doi.org/10.5593/sgem2015/b41/s17.050