1. Feinstein, B. et al. (1955) Morphologic studies of motor units in normal human muscles.Acta Automatica,23, 127.
2. Granit, Ragnar (1957) Systems for control of movement.Premier Congres International des sciences neurologiques, 63.
3. Knnen, E. (1965) Electrical impedance of human skin.Med. biol. Engng,3, 67.
4. Licht, S. (1961)Electrodiagnosis and electromyography. Waverly Press, Baltimore.
5. Matthews, P. B. C. (1964) Muscle spindles and their motor control.Physiol. Rev.,44, 219.