Merletti, R Surface EMG signal processing during isometric contractions. [electronic resource] - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology Dec 1997 - 241-250 p. digital Publication Type: Journal Article ISSN: 1873-5711 Standard No.: 10.1016/s1050-6411(97)00010-2 doi