N R Poulter, J E Sanderson, A V Thompson, P S Sever, C L Chang
Poulter N R, Sanderson J E, Thompson A V, Sever P S, Chang C L.
Comparison of nifedipine and propranolol as second line agent for hypertension in black Kenyans.
British Medical Journal 1993; 306 :621
doi:10.1136/bmj.306.6878.621