1. G. W. Rathenau:Magnetic Properties of Metals and Alloys, American Society for Metals (1959).
2. Annual Conference of the South African Institute of Physics (1955).
3. G. Biorci, A. Ferro andG. Montalenti: Technical Report 2a A.R.D.C. Contract no. AF 61 (514)-1331 (October 1958).
4. F. Vicena:Czechosl. Journ. Phys.,5, 4 (1955).
5. G. Biorci, A. Ferro andG. Montalenti: Technical Report 1c A.R.D.C. Contract no. AF 61 (514-1331 (March 1958).