Authors: D W Dockery; C A Pope; X Xu; J D Spengler; J H Ware; M E Fay; B G Ferris; F E Speizer Journal: N Engl J Med Date: 1993-12-09 Impact factor: 91.245
Authors: C A Pope; M J Thun; M M Namboodiri; D W Dockery; J S Evans; F E Speizer; C W Heath Journal: Am J Respir Crit Care Med Date: 1995-03 Impact factor: 21.405