1. The physiological basis of myotonia. In: editor. Pathogenesis of human muscular dystrophies. Amsterdam: Excerpta Medica; 1977. p 717–718.
2. An introduction to electromyography. Copenhagen: Gyldendal; 1957. p 33.
3. International Federation of Societies for Electroencephalography and Clinical Neurophysiology. Recommendations for the practice of clinical neurophysiology. Amsterdam: Elsevier; 1983. p 144.