1. Baker, M.J. (1972). Variability in the strength of structural steels a study in structural safety. Part 1: Material variability (Technical Note 44, 100 pp). London: Construction Industry Research and Information Association (CIRIA).
2. Baker, M.J. (1973). Variability in the strength of structural steels a study in structural safety. Part 2: Proposals for statistical acceptance criteria for structural steels (Technical Note 47, 43 pp). London: Construction Industry Research and Information Association (CIRIA).