1. The microwave gyrator;Hogan;Bell Syst. Tech. J.,1952
2. Broadbanding ferrite microwave isolators;Vartanian;IRE National Convention Record,1956
3. Broad-band isolators and variable attenuators for millimeter wavelengths;Barnes;IRE Trans. Microwave Theory Tech.,1961
4. Improved rectangular waveguide resonance isolators;Weiss;IRE Trans. Microwave Theory Tech.,1956