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2. private communication. May 1990, Syracuse. NY.
3. The Em User's Manual, May 1990.
4. An Electromagnetic Time-Harmonic Analysis of Shielded Microstrip Circuits
5. and , “New aspects concerning the definition of microstrip characteristic impedance as a function of frequency.” IEEE MTT-S International Microwave Symp. Dig., 1982, pp. 305–307.