1. Robb GP, Steinberg I: Visualization of the chambers of the heart, pulmonary circulation, and great blood vessels in man. AJR 1: 1–17, 1938
2. Frost MM, Fisher HD, Nudelman S, Roehrig H: A digital video acquisition system for extraction of subvisual information in diagnostic medical imaging. Proc SPIE Appl Opt Instrument Med VI, Sept 25–27, Bellingham, WA 127:208–215, 1977
3. Heintzen PH, Brennecke R, Bursch JH: Automated videoangiographic image analysis. Comp in Cardiol (IEEE) 8: 55–64, 1975
4. Kruger RA, Mistretta CA, Houk TL, Reiderer SJ, Shaw CB, Goodsitt MM, Crummy AB, Zweibel WZ, Lancaster JC, Rowe GG, Flemming D: Computerized fluoroscopy in real time for noninvasive visualization of the cardiovascular system. Radiology 130: 49–57, 1979
5. Wood EH, Sturm RE, Sanders JJ: Data processing in cardiovascular physiology with particular reference to roentgen videodensitometry. Mayo Clin Proc 39: 849–865, 1964