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2. Baum, G.: A comparison of the merits of scanned intensity modulated ultrasonography vs. unscanned A scope ultrasonography. Proc. First Internat. Conf. on Diag. Ultrasound, University of Pittsburgh, 1965, pp. 59–71.
3. Purnell, E. W.: Ultrasound in Ophthalmological Diagnosis. Proc. First Internat. Conf. on Diag. Ultrasound, pp. 95–110, University of Pittsburgh, 1965.
4. Intensity modulated (B-scan) ultrasonography;Purnell,1967
5. A critique of time-amplitude ultrasonography;Baum;Arch. Ophth.,1961