Mullen, J. B., Wright, J. L., Wiggs, B. R., Paré, P. D., & Hogg, J. C. (1987). Structure of central airways in current smokers and ex-smokers with and without mucus hypersecretion: Relationship to lung function. Thorax.

Mullen, J B., J L. Wright, B R. Wiggs, P D. Paré, and J C. Hogg. "Structure of Central Airways in Current Smokers and Ex-smokers With and Without Mucus Hypersecretion: Relationship to Lung Function." Thorax 1987.

Mullen, J B., et al. "Structure of Central Airways in Current Smokers and Ex-smokers With and Without Mucus Hypersecretion: Relationship to Lung Function." Thorax 1987.