1. Radiocardiograms: Electrical impedance changes of the heart in relation to electrocardiograms and heart sounds;Nyboer;J Clin Invest,1940
2. Development and evaluation of an impedance cardiac output system;Kubicek;Aerosp Med,1966
3. Development of an electrical impedance plethysmography system to monitor cardiac output;Patterson,1964
4. Impedance cardiography as a non-invasive method to monitor cardiac function and other parameters of the cardiovascular system;Kubicek;Ann NY Acad Sci,1970
5. Theory and cardiac applications of electrical impedance measurements;Penney;Crit Rev Biomed Eng,1986