1. 1 Aki K. & Richards P.G. , 1980 Quantitative Seismology, W.H. Freeman, San Francisco.
2. Bayesian inference in geomagnetism,;Backus;Geophys. J.,,1988
3. 3 Bloxham J. & Jackson A. , 1989 Simultaneous stochastic inversion for geomagnetic main field and secular variation 2. 1820-1980, J. geophys. Res., B94, 15 753-15 769.
4. Nullspace shuttles,;Deal;Geophys. J. Int.,,1996
5. A simulation study of alternatives to ordinary least squares,;Dempster;J. Am. stat. Assoc.,,1977