1. Crackles and wheezes;Forgacs, P.;Lancet,1967
2. Inspiratory crackles early and late;Nath, A.R.; Capel, L.H.;Thorax,1974
3. Trail R. Chest examination. Edinburgh: J and A Churchill, 1948; 57.
4. Airway dynamics in bronchiectasis;FraEer, R.G.; Maclem, P.T.; Brown, W.G.;AJR,1965
5. Bass H, Henderson JAM, Heckscher T, Oriol A, Anthonisen NR. Am Rev Respir Dis 1968; 97: 598.