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3. Numerical applications of a formalism for geophysical inverse problems;Backus;Geophys. J. Roy. Astron. Soc.,1967
4. The resolving power of Gross earth data;Backus;Geophys. J. Roy. Astron. Soc.,1968
5. Uniqueness in the inversion of inaccurate gross earth data;Backus;Philos. Trans. Roy. Soc.,1970