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Vukovich, R. A., J. E. Foley, B. Brown, D. A. Willard, M. Buckley, D. O'Kelly, D. Fitzgerald, W. Tormey, ja A. Darragh. Effect of β-blockers On Exercise Double Product (systolic Blood Pressure × Heart Rate). 1979.

Vukovich, R. A., et al. Effect of β-blockers On Exercise Double Product (systolic Blood Pressure × Heart Rate). 1979.