Tyrrell, W.A. (1947). "Hybrid Circuits for Microwaves". Proceedings of the IRE. 35 (11). Institute of Electrical and Electronics Engineers (IEEE): 1294–1306. doi:10.1109/jrproc.1947.233572. ISSN0096-8390.
radartutorial.eu
Wolff, Christian (17 November 1998). "Waveguide Junctions". www.radartutorial.eu. Retrieved 31 July 2023.
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Tyrrell, W.A. (1947). "Hybrid Circuits for Microwaves". Proceedings of the IRE. 35 (11). Institute of Electrical and Electronics Engineers (IEEE): 1294–1306. doi:10.1109/jrproc.1947.233572. ISSN0096-8390.