G. Vasseur, K. Babour, Michel Menvielle, Jean-Claude Rossignol. The geomagnetic variation anomaly in the northern Pyrenees: study of the temporal variation.
Geophysical Journal International, Oxford University Press (OUP), 1977, 49 (3), pp.593-607.
⟨10.1111/j.1365-246X.1977.tb01306.x⟩.
⟨insu-02155799⟩