1. Abramowitz, M., and I.A. Stegun (eds.) (1970), Handbook of Mathematical Functions: with Formulas, Graphs and Mathematical Tables, 9th ed., Dover Publ., New York, 1046 pp.
2. Anderson, K.R. (1982), Robust earthquake location using M-estimates, Phys. Earth Planet. In. 30,2–3, 119–130, DOI: 10.1016/0031-9201(82)90096-6.
3. Bender, B. (1988), Reliability of estimates of maximum earthquake magnitudes based on observed maxima, Seism. Res. Lett. 59,1, 15 (abstract).
4. Brandt, M.B.C., B. Bejaichund, E.M. Kgaswane, E. Hattingh, and D.L. Roblin (2005), Seismic History of Southern Africa, Seism. Ser., Vol. 37, Council for Geoscience, Pretoria, 32 pp.
5. Campbell, K.W. (1982), Bayesian analysis of extreme earthquake occurrences. Part I. Probabilistic hazard model, Bull. Seism. Soc. Am. 72,5, 1689–1705.