Calcagnotto, M., Adachi, Y., Ponge, D., & Raabe, D. (2011). Deformation and fracture mechanisms in fine- and ultrafine-grained ferrite/martensite dual-phase steels and the effect of aging. Acta Materialia, 59(2), 658-670. doi:10.1016/j.actamat.2010.10.002.