Jin-Ling Tang, Joan K Morris, Nicholas J Wald, David Hole, Martin Shipley, Hugh Tunstall-Pedoe et al
Tang J, Morris J K, Wald N J, Hole D, Shipley M, Tunstall-Pedoe H et al.
Mortality in relation to tar yield of cigarettes: a prospective study of four cohorts
BMJ 1995; 311 :1530
doi:10.1136/bmj.311.7019.1530