1. Aki, K. and P.G. Richards, 1980, Quantitative Seismology, Theory and Methods. Volume I, W.H. Freeman, San Francisco, 557pp.
2. Aki, K. and P.G. Richards, 2002, Quantitative Seismology, 2nd ed., University Science Books, Sausalito, 700pp.
3. Forbes, C.B., R. Obenchain, and R.J. Swain, 1965, The LASA sensing system design, installation, and operation, IEEE, 53, 1834-1843.