1. Thirlaway, H.I.S., 1963. “Earthquake or Explosion?” New Scient, 18, pp 311–315.
2. Birtill, J.W., and Whiteway, F.E., 1965. “The application of phased arrays to the analysis of seismic body waves.” Phil Trans Roy Soc, Series A, 258, pp 421–493.
3. Evernden, J.F., 1975. “Further studies on seismic discrimination.” Bull Seis Soc Am, 65, pp 359–391.
4. Bullen, K.E., 1963. “An Introduction to the theory of seismology.” 3rd Edition, Cambridge University Press.
5. Herrin, E., and Taggart, J., 1968. “Source bias in epicentre determinations.” Bull Seis Soc Am, 58, pp 1791–1796.