Abe, F., Heat-to-heat variation in long-term creep strength of some ferritic steels, International Journal of Pressure Vessels and Piping, 87, 310-318, (2010)
Brennan, K., Brett, S. J. and Eaton-Mckay, J., Impression creep testing of aberrant grade 91 material removed from piping in service, 4th International ECCC conference (2017).