Laakso, Timo I.; Välimäki, Vesa; Karjalainen, Matti A.; Laine, Unto K. (January 1996), "Splitting the unit delay [FIR/all pass filters design]", IEEE Signal Processing Magazine, vol. 13, no. 1, pp. 30–60, Bibcode:1996ISPM...13...30L, doi:10.1109/79.482137
Laakso, Timo I.; Välimäki, Vesa; Karjalainen, Matti A.; Laine, Unto K. (January 1996), "Splitting the unit delay [FIR/all pass filters design]", IEEE Signal Processing Magazine, vol. 13, no. 1, pp. 30–60, Bibcode:1996ISPM...13...30L, doi:10.1109/79.482137