1. Densitography: a new method for evaluation of cardiac performance at rest and during exercise;Chirife, R.; Spodick, D.H.;American HeartJournal,1972
2. Effects of the Valsalva maneuver on the cardiac systolic intervals: beat-to-beat versus timed analysis;Flessas, A.P.; Kumar, S.; Spodick, D.H.;American Heart journal, So,1970
3. Effects of the Valsalva manoeuvre on blood flow in the thoracic aorta in man;Fox, I.J.; Crowley, Jr., W.P.; Grace, J.B.; Wood, E.H.;Journal of Applied Physiology,1966
4. The Valsalva maneuver as a test of cardiac function;Gorlin, R.; Knowles, J.H.; Storey, C.F.;American journal of Medicine,(957).
5. Pressure-flow studies in man during the Valsalva maneuver with observations on the mechanical properties of the ascending aorta;Greenfield, J.C.; Cox, R.L.; Hernandez, R.R.; Thomas, C.; Schoomaker, F.V.;Circulation,1967