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2. Breath sounds and distribution of pulmonary ventilation;LeBlanc;Am Rev Respir Dis,1970
3. Breath sounds and regional ventilation;Ploy-Song-Sang;Am Rev Respir Dis,1977
4. Correlation of clinical signs with ventilatory function in obstructive lung disease;Schneider;Ann Intern Med,1965
5. Inspiratory crackles: Early and late;Nath;Thorax,1974