Ramírez de la Piscina P., Homs N. "Preface to the special issue on the VII symposium on hydrogen, fuel cells and advanced batteries, HYCELTEC 2019, 1–3 July 2019, Barcelona, Spain" International Journal of Hydrogen Energy 45, 40, pp. 20535 - 2020 DOI: 10.1016/j.ijhydene.2020.05.106