BJÖRK LARS, ERIKSON UNO, and HALLSTRÖM ARNE. 1974. “The Videovolumeter: A New Desk-Top Instrument for Real Time Videodensitometric Analysis of Dynamic Contrast Agent Changes in Roentgen Images”. Upsala Journal of Medical Sciences 79 (3):148-54. https://doi.org/10.3109/03009737409178396.