Group delay approximation of allpass digital filters by transforming the desired response. - Tatsuya Matsunaga; Masaaki Ikehara (ICASSP (6), 2003)

Design of IIR digital filters in the complex domain by transforming the desired response. - Tatsuya Matsunaga; Masahiro Yoshida; Masaaki Ikehara (IEEE Trans. Signal Process., 2004)