1. Gleeton, C. E. and Williams, N. H.
Phys. Rev. 45 (1934) 234
2. M.I.T Radiation Laboratory Series No. 11;CG Montgomery,1947
3. M.I.T Radiation Laboratory Series No. 11;CG Montgomery,1947
4. Bethe, H. A. Radiation Laboratory Reports Nos. 194 and 199 (1943)
5. Montgomery, G. G.
Technique of Microwave Measurements p. 774 (1947)