Torrell, M.; Morata, A.; Kayser, P.; Kendall, M.; Kendall, K.; Tarancon, A. "Performance and long term degradation of 7 W micro-tubular solid oxide fuel cells for portable applications" Journal of Power Sources 285, pp. 439 - 448. 2015 DOI: 10.1016/j.jpowsour.2015.03.030