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2. Measurement of choroidal pulsations using M-scan ultrasound;Coleman, D.J.;American Journal of Ophthalmology,1971
3. A constant depth ultrasonic scanner;McCready, V.R.; Hill, C.R.;British Journal ofRadiology,1971
4. McLeod, D., Restori, M., and Wright, J. E. (1977). Rapid
5. B-scanning of the Vitreous;British Journal of Ophthalmology