1. Copenhagen: Scandinavian University Books 1957:43.
2. Introduction to Clinical Electromyography;Lenman, J.A.R.; Ritchie, A.E.,1970
3. Electrodiagnosis in Neuromuscular Diseases;Goodgold, J.; Eberstein, A.,1977
4. Menlo Parks,1978
5. Electromyography in Practice;Ludin, H.P.