1. A Method of Analysis of Symmetrical Four-Port Networks;Reed;IRE Trans. Microwave Theory Tech.,1960
2. Interdigitated Stripline Quadrature Hybrid;Lange;IEEE Trans. Microwave Theory Tech.,1969
3. Unfolding the Lange Coupler;Waugh;IEEE Trans. Microwave Theory Tech.,1972
4. Multilayer Design Techniques for Extremely Miniaturized CMOS Microwave and Millimeter-Wave Distributed Passive Circuits;Chirala;IEEE Trans. Microwave Theory Tech.,2006