Number | Name | Date | Kind |
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4694434 | Von Ramm et al. | Sep 1987 |
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"A Nonlinearly Processed Array for Enhanced Azimuthal Resolution", Donn D. Lobdell, IEEE Trans Son Ultrason SU-15, No. 4, pp. 202-208, Oct. 1968. |
"Signal Processing Techniques for Improving B-Mode Echoencephalography", Smith et al., Ultrasound in Medicine, vol. 1, Plenum Press, New York, pp. 405-414, 1975. |