1. Anderson, A. E., andA. G. Foraker: Relative dimensions of bronchioles and parenchymal spaces in lungs from normal subjects and emphysematous patients. Amer. J. Med.32, 218 (1962).
2. Biermer, A.: Handb. spez. Path. Ther., Bd. 5. Erlangen: Enke 1854.
3. Bryant, L. R., B. Eiseman, andH. K. Gan: The significance of tracheobronchialcollapse in obstructive emphysema. Med. thorac.22, 244 (1965).
4. Bullowa, J. G. M., andC. Gottlieb: Roentgen ray studies of bronchial function. Med. Res.97, 251 (1920).
5. Dayman, H.: Mechanics of airflow in health and in emphysema. J. clin. Invest.30, 1175 (1951)