- Nifedipine in unstable angina: a double-blind, randomized trial. Gerstenblith, G., Ouyang, P., Achuff, S.C., Bulkley, B.H., Becker, L.C., Mellits, E.D., Baughman, K.L., Weiss, J.L., Flaherty, J.T., Kallman, C.H., Llewellyn, M., Weisfeldt, M.L. N. Engl. J. Med. (1982)