1. Manual materials handling;Ayoub,1987
2. Muscles Alive;Basmajian,1985
3. Occupational Biomechanics;Chaffin,1991
4. The use of surface electromyography in biomechanics;De Luca;Journal of Applied Biomechanics,1997
5. EMG alterations at sustained contractions with special emphasis on applications in ergonomics;Hagg,1996