References
- Myers G. G., Krapohl A. J., Varner J. Obstetrics and Gynaecology NY 1967; 30: 327–333
- Smyth C. N. Journal of Obstetrics and Gynaecology of the British Commonwealth 1957; 77: 908
- La Croix G. E. American Journal of Obstetrics and Gynaecology 1968; 101: 111
- Carter M. C., Steer P. J. Application of Electronics in Medicine. Institute of Electronic and Radio Engineers, London 1976; 293–300
- Bashford C. C., Randall N. J., Antebi D. Biomedical Engineering 1976; 11(11)378–379