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Orloff, Ken; Nystrom, Charles W. "Subject: Effect of Passive Smoking on Respiratory Function - F. Kauffmann and S. Perdrizet Eur. Journal Resp. Dis. 62 (Supp. 113)1981". 22 Sep 1981. Bates: 504339165-504339166.
http://tobaccodocuments.org/mayo_clinic/504339165-9166.html