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Caloz, C., Itoh, T., & Rennings, A. (2008). CRLH metamaterial leaky-wave and resonant antennas. IEEE Antennas and Propagation Magazine, 50(5), 25-39. External link
Itoh, T., Sanada, A., & Caloz, C. (2008). Zeroth-order resonator. (Patent no. US7391288). External link