References
- Griffiths C.J. Combined display of video image with superimposed analogue waveforms for clinical applications. Clinical Physics and Physiological Measurement 1987; 8: 367–373
- Selley W. G., Flack F. C., Ellis R. E., Brooks W. A. Respiratory Patterns Associated with Swallowing: Part 1. The Normal Adult Pattern and Changes with Age. Age and Ageing 1989; 18: 168–172