1. Development of a 12 element annular array transducer for realtime ultrasound imaging.;Foster;Ultrasound in Med. & Biol.,1989
2. A digital annular array prototype scanner for realtime ultrasound imaging.;Foster;Ultrasound in Med. & Biol.,1989
3. Hewlett Packard Journal 10, Vol. 34. (Oct. 1983). Describes the operation of HP's first generation of imaging systems in detail.
4. Hewlett Packard Journal 12, Vol. 34. (Dec. 1983). A special issue that continues the description in the above reference.
5. Acoustic Waves: Devices, Imaging, and Analog Signal Processing.;Kino,1987