1. S. J. Sokolov, The ultrasonic microscope. Dokl. Adad. Nauk U. S. S. R., 64: 333 (1949).
2. C. N. Smyth, F. Y. Paynton, and U. F. Sayers, The ultrasound image camera, Proc. I. E. E., 110 (1) : 16 (1963).
3. J. E. Jacobs and D. A. Peterson, Advances in the Sokoloff tube, in: “Acoustical holography”, Vol. 5: 633, Plenum Press, New York (1974).
4. R. C. Addison, A progress report on the Sokolov tube utilizing a metal fiber faceplate, in: “Acoustical holography”, Vol. 5: 659, Plenum Press, New York (1974).
5. A. K. Nigam and J. C. French, Modified Sokolov camera utilizing condenser-microphone array of the foil-electret type, in: “Acoustical holography”, Vol. 5: 685, Plenum Press, New York (1974).