1. The turnstile circulator;Allen P.J.;IRE Trans. Microw. Theory Tech.,1956
2. Beust W.andJohnston E.G.(1960).High average power rotator.Microw. J. (May).
3. Casswell D.(1964).Faraday rotation devices.Microwaves24.
4. Broadband ferrite rotators using quadruply ridged circular waveguide;Chait H.;IRE Trans. Microw. Theory Tech.,1959
5. A perturbation method for circular waveguides containing ferrites;Clarricoats P.J.B.;Proc. IEEE,1959