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3. P. Ripka, Magnetic Sensors and Magnetometers (Artech House, Boston, 2001)
4. H. Chiriac, J. Yamasaki, T.A. Ovari, M. Takajo, IEEE Trans. Magn. 3, 3901 (1999)
5. A. Bulsara, C. Seberino, L. Gammaitoni, M. Karlsson, B. Lundqvist, J.W.C. Robinson, Phys. Rev. E 67, 016120 (2003)