Ouslis, C.; Snelgrove, M.; Sedra, A.S. . (1991). [IEEE 1991., IEEE International Sympoisum on Circuits and Systems - Singapore (11-14 June 1991)] 1991., IEEE International Sympoisum on Circuits and Systems - A filter designer's filter design aid: filtorX. , (), 376–379.
doi:10.1109/iscas.1991.176352
