Power sources involving ~ 300W PEMFC fuel cell stacks cooled by different mediaMagdalena Dudek, Andrzej Raźniak, Bartłomiej Lis, Michał Kawalec, Mariusz Krauz and Tadeusz WójcikE3S Web Conf., 14 (2017) 01042DOI: https://doi.org/10.1051/e3sconf/20171401042