1. A reduction in maximum midexpiratory flow rate: A spirographic manifestation of small-airways disease;McFadden;Am J Med,1972
2. Permutt S. Menkes HA. Spirometry-analysis of forced expiration within the time domain. The lung in the transition between health and disease. Macklem PT Permutt S. 1979 Marcel Dekker New York 124
3. ATS Statement, Snowbird workshop on standardization on spirometry;Gardner;Am Rev Respir Dis,1979
4. Spirometric standards for healthy nonsmoking adults;Morris;Am Rev Respir Dis,1971
5. Normal values for the ratio of one-second forced expiratory volume to forced vital capacity;Morris;Am Rev Respir Dis,1973