1. O. R. Gericke: US Army Materials Research Agency Technical Report TR 64-44 (December 1964).
2. O. R. Gericke: Experimental Determination of Ultrasonic Transducer Frequency Response, US Army Materials Research Agency, Report (in process).
3. O. R. Gericke: Materials Research and Standards, 1965, vol. 5, no. 1, pp. 23–30.