1. Andersen I, Proctor DF. The fate and effect of inhaled materials. In: Proctor DF, Andersen I. eds. The nose. Elsevier, Amsterdam, 1982, pp 423–455
2. Sleigh MA, Blake JR, Liron N (1988) The propulsion of mucus by cilia. Am Rev Respir Dis 137:726–774
3. Leith D (1968) Cough. Phys Ther 488:439–447
4. Murray JF (1986) The normal lung. WB Saunders, Philadelphia
5. Wanner A (1977) Clinical aspects of mucociliary transport. Am Rev Respir Dis 115:73–125