1. H. G. VanBueren,Imperfections in Crystals(North-Holland Publishing Company, Amsterdam; Interscience Publishers, Inc., New York, 1960).
2. C. Zener,Elasticity and Anelasticity of Metals(University of Chicago Press, Chicago, Illinois, 1956).
3. Sanborn Company, logarithmic preamplifier model 350-1400.
4. In the actual apparatus which has been built the film can be deposited only on one side of the substrate.
5. G. W. Rathenau,Magnetic Properties of Metals and Alloys(American Society for Metals, Cleveland, Ohio, 1959), Chap. 9.