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Foster, R. M. (1924). A Reactance Theorem. Bell System Technical Journal, 3(2), 259-267. doi:10.1002/j.1538-7305.1924.tb01358.x
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Mirzaei, H., & Eleftheriades, G. V. (2013). Realizing Non-Foster Reactive Elements Using Negative-Group-Delay Networks. IEEE Transactions on Microwave Theory and Techniques, 61(12), 4322-4332. doi:10.1109/tmtt.2013.2281967
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