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2. Application of a non-linear boundary value problem for Laplace's equation to gravity and geomagnetic intensity surveys;Backus;Q. J. Mech. Appl. Math.,1968
3. Non-uniqueness of the external geomagnetic field determined by surface intensity measurements;Backus;J. Geophys. Res.,1970
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5. Derivation of the international geomagnetic reference field;Cain;U.S. Natl. Aeronautics and Space Adm. Tech. Note D-6237 (IGRF 10/68),1971