WANG, LI, DOU, RUI, WANG, GONG, LI, YIZHE, BAI, MINGWEN, HALL, DAVID and CHEN, YING, 2017. Subcritical crack growth behaviour of a perovskite- structured Ba0.5Sr0.5Co0.8Fe0.2O3−δ oxygen transport membrane: International Journal of Applied Ceramic Technology International Journal of Applied Ceramic Technology. in press