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3. W. Dietrich, W. Proebster, and P. Wolf, IBM J. Rev. Dev.,4, 189 (1960).
4. I. A. Efimov, Investigation of the Demagnetization Time of Ferromagnetic Film Elements [in Russian], ITM i VT AN SSSR, Moscow (1961).
5. G. M. Rodichev and N. P. Lyakhovskii, Izv. Akad. Nauk SSSR, Ser. Fiz.,30, 621 (1966).