1. Weibel ER. Geometric and dimensional airway models of conductive, transitory and respiratory zones of the human lung. In: Morphometry of the human lung. Berlin, Heidelberg: Springer; 1963. p. 136–42.
2. Wiggs BR, Moreno R, Hogg JC, Hilliam C, Paré PD. A model of the mechanics of airway narrowing. J Appl Physiol. 1990;69(3):849–60.
3. Okuda K, Chen G, Subramani DB, Wolf M, Gilmore RC, Kato T, et al. Localization of secretory mucins MUC5AC and MUC5B in normal/healthy human airways. Am J Respir Crit Care Med. 2019;199(6):715–27.
4. Young CD, Moore GW, Hutchins GM. Connective tissue arrangement in respiratory airways. Anat Rec. 1980;198(2):245–54.
5. Burgel PR, Bergeron A, de Blic J, Bonniaud P, Bourdin A, Chanez P, et al. Small airways diseases, excluding asthma and COPD: an overview. Eur Respir Rev. 2013;22(128):131–47.