1. Particle growth in the airways and the influence of airflow;Pritchard,1987
2. Lung defense mechanisms;Newhouse;N Engl J Med,1976
3. Clinical aerosols. I. Characterization of aerosols and their diagnostic uses;Lourenco;Arch Intern Med,1982
4. Particle transport onto human airway surfaces;Heyder;Eur J Respir Dis,1982
5. United States Pharmacopeia,2006