1. Means for indicating flaws in material;Sokoloff;US Patent 2, 164, 125,1939
2. A review of ultrasonic imaging methods with a selected annotated bibliography;Berger,1963
3. Visualization of the cross-section of a sound beam by Bragg diffraction of light;Korpel;Applied Physics Letters,1966
4. An instrument for making surface waves visible;Adler;IEEE Transactions on Sonics and Ultrasonics,1968
5. Sound holograms and optical reconstruction;Mueller;Applied Physics Letters,1966