1. R. F. Soohoo, Magnetic Thin Films, Harper and Row, New York (1965).
2. M. Prutton, Thin Ferromagnetic Films, Butterworths, London (1964).
3. K. L. Chopra, Thin Film Phenomena, McGraw-Hill, New York (1969).
4. E. W. Pugh and T. O. Mohr, in Thin Films, Chapman and Hall (1964).
5. M. S. Cohen, in Handbook of Thin Film Technology, L. I. Maissel and R. Glang, eds., McGraw-Hill, New York (1970), Section 17-1.