Peach, H., Hayward, D. M., Ellard, D. R., Morris, R. W., & Shah, D. (1986). Phlegm production and lung function among cigarette smokers changing tar groups during the 1970s.

Peach, H., D M. Hayward, D R. Ellard, R W. Morris, and D. Shah. Phlegm Production and Lung Function Among Cigarette Smokers Changing Tar Groups During the 1970s. 1986.

Peach, H., et al. Phlegm Production and Lung Function Among Cigarette Smokers Changing Tar Groups During the 1970s. 1986.