1. Bergveld, P., Kolling, A. J. andPeuscher, J. H. J. (1985) Realtime fetal ECG recording.IEEE Trans.,BME-33, 505–508.
2. Creoles, W., Restivo, M., Assadi, M. A. andEl-sherif, N. (1986) Criteria for optimal averaging of cardiac signals.Ibid.,,BME-33, 957–966.
3. Ferrara, E. R. (1977) The time-sequenced adaptive filter. Ph.D. dissertation, Stanford University, California, USA.
4. Ferrara, E. R. andWidrow, B. (1981a) The time-sequenced adaptive filter.IEEE Trans.,ASSP-29, 679–683.
5. Ferrara, E. R. andWidrow, B. (1981b) Multichannel adaptive filter for signal enhancement.Ibid.,,ASSP-29, 766–770.