1. Dussik K, Dussik F, Wyt L (1947) Auf dem Wege zur Hyperphonographie des Gehirnes. Wien med Wschr 97: 425–429
2. French LA, Wild JJ, Neal D (1950) Detection of cerebral tumors by ultrasonic pulses; pilot studies on postmortem material. Cancer 3: 705–708
3. Ballantine HT Jr, Bolt RH, Hueter TF, Ludwig GD (1950) On the detection of intracranial pathology by ultrasound, vol 112. Science, New York, pp 525–528
4. Ballantine HT Jr, Ludwig GD, Bolt RH, Hueter TF (1950) Ultrasonic localization of the cerebral ventricles. Trans Am Neurol Assoc 51: 38–41
5. Voorhies RM, Patterson RH (1980) Preliminary experience with intra-operative ultrasonographic localization of brain tumors. Radiol Nucl Med 10: 8–9