1. J. B. Hughes, N. C. Bird, and I. C. Macbeth, “Switched Currents — A New Technique for Analog Sampled-Data Signal Processing”, Proc. of Int. Symp. Circuits And Systems (ISCAS), Portland, Oregon, pp. 1584–1587, May 1989, IEEE.
2. D. Vallancourt, and Y. P. Tsividis, “Sampled-Current Circuits”, Proc. of Int. Symp. Circuits And Systems (ISCAS), Portland, Oregon, pp. 1592–1595, May 1989, IEEE.
3. B. Jonsson, and S. Eriksson, “Current-Mode N-port Adaptors for Wave SI Filters”, Electron. Lett., Vol. 29, No. 10, pp. 925–926, May 1993.
4. B. Jonsson, and S. Eriksson, “A Low Voltage Wave SI Filter Implementation Using Improved Delay Elements”, Proc. of Int. Symp. Circuits And Systems (ISCAS), London, UK, pp. 5.305–5. 308, May 1994, IEEE.
5. L. Wanhammar, DSP Integrated Circuits, Academic Press Series in Engineering, 1999.