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References
Review:Combined Use of Calcium-Channel and Beta-Adrenergic Blockers for the Treatment of Chronic Stable Angina: Rationale, Efficacy, and Adverse Effects
William E. Strauss and
Alfred F. Parisi
Ann Intern Med October 1, 1988 109:570-581; doi:10.1059/0003-4819-109-7-570