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M. A. Prabhu and V. Van, “Asymmetric optical filters based on asynchronous coupled microring resonators,” 2007 Conference on Lasers and Electro-Optics – Pacific Rim, Seoul, 2007 (web)

V. Van, “Circuit-based method for synthesizing serially-coupled microring filters”, IEEE/OSA Journal of Lightwave Technology, vol. 24, pp. 2912, 2006 (web)