1. Regional variations in vital capacity in adult males in India: comparison of regression equations from four regions and impact on interpretation of spirometric data;Chhabra;Indian J Chest Dis Allied Sci,2009
2. Spirometry reference values for American Indian adults, results from the strong heart study;Marion;Chest,2001
3. A study of ventilatory functions in healthy Indian adults;Raghavan;J Postgrad Med (Bombay),1965
4. Lung function studies in healthy Indian subjects;Udwadia;J Assoc Phys India,1987
5. Standardization of spirometry;Miller;Eur Respir J,2005