1. AAMI (Association for the Advancement of Medical Instrumentation) (1981) Standard for electrocardiographic devices. AAMI ECG-D 8/81. Arlington, VA, USA.
2. Berson, A. S. andPipberger, H. V. (1966) The low frequency response of electrocardiographs, a frequent source of recording errors.Am. Heart J.,71, 779–789.
3. CSA (Canadian Standards Association) (1982) Diagnostic electrocardiographs. CSA Z 303.1-M1982. Rexdale Ontario, Canada.
4. Gabel, R. A. andRoberts, R. A. (1980)Signals and linear systems. Wiley, New York.
5. IEC (International Electrotechnical Commission subcommittee 62D) (1978) Performance requirements for single channel and multichannel electrocardiographs. Draft IEC 62D (central office), Geneva, Switzerland.