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3. Nifedipine and Raynaud's phenomenon (letter);Kahan;N Engl J Med,1981
4. Calcium channel blockers and Raynaud's disease (letter);Vayssairat;N Engl J Med,1981
5. Controlled double-blind trial of nifedipine in the treatment of Raynaud's phenomenon;Rodeheffer;N Engl J Med,1983