1. Recommendations for the Standardization and Interpretation of the Electrocardiogram
2. The Glasgow system;Macfarlane,1977
3. DePinto V. ECG muscle artifact filter system. US Patent 5,259,387. 1993
4. Mortara D. Filter apparatus and method for reducing signal noise using multiple signals obtained from a single source. US Patent 5,421,342. 1995
5. Discrete-time signal processing;Oppenheim,1989