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The non-uniqueness of external vector fields determined from their magnitude on a spherical surface - application to the geomagnetic field

Authors: P. Alberto, O. Oliveira, M. A. Pais, R. Guedes Jr

Ref.: Proceedings of the XII Fall Workshop on Geometry and Physics, eds H. Albuquerque, J. Clemente-Gallardo, J.M. Nunes da Costa, J. Teles, Publicaciones de la Real Sociedad Matemática Española (RSME) 7, 127-132 (2004)