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Calcium antagonist drugs in chronic stable angina. Comparison of verapamil and nifedipine.Dawson, J R; Whitaker, N H; Sutton, G C · Heart · 1981
Randomized double-blind comparison of verapamil and nifedipine in chronic stable anginaV.Bala Subramanian; Michael J. Bowles; Nardev Singh Khurmi; Anthony B. Davies; Edward B. Raftery · 1982