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.
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.