1. G. S. Gorelik, Izv. Akad. Nauk USSR,14, No. 2 (1950).
2. N. N. Kolachevskii, Magnetic Noise [in Russian], Nauka, Moscow (1971).
3. M. A. Rozenblat, Magnetic Elements for Automatic Control and Computer Technology [in Russian], Nauka, Moscow (1966).
4. Yu. V. Afanas'ev, Ferromagnetic Probes, �nergiya, Leningrad (1969).
5. D. I. Gordon et al., IEEE Trans. Magn.,MAG-4, No. 3 (1968).