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Matsuno, T. , Otani, Y. , Tanaka, R. , Ikezaki, K. , Yamamoto, H. , Fujieda, M. , Ishida, Y.. "Enhanced Parallel-Connected Comb Filter Method for Multiple Pitch Estimation". World Academy of Science, Engineering and Technology, Open Science Index 36, International Journal of Electronics and Communication Engineering (2009), 3(12), 2385 - 2388.