Downs, C. A., Coleman, J. S., Heckathorn, S. A. (1999). The chloroplast 22-Ku heat-shock protein: A lumenal protein that associates with the oxygen evolving complex and protects photosystem II during heat stress, Journal of Plant Physiology, 155 (4-5), 477-487, 10.1016/S0176-1617(99)80042-X