M. R. Miller, J. Hankinson, V. Brusasco, F. Burgos, R. Casaburi, A. Coates, R. Crapo, P. Enright, C. P. van der Grinten, P. Gustafsson, R. Jensen, D. C. Johnson, N. MacIntyre, R. McKay, D. Navajas, O. F. Pedersen, R. Pellegrino, G. Viegi and J. Wanger, “Standardisation of Spirometry,” European Respiratory Journal, Vol. 26, No. 2, 2005, pp. 319-338. http://dx.doi.org/10.1183/09031936.05.00034805
 “Lung Function Testing: Selection of Reference Values and Interpretative Strategies. American Thoracic Society,” American Review of Respiratory Disease, Vol. 144, No. 5, 1991, pp. 1202-1218. http://dx.doi.org/10.1164/ajrccm/144.5.1202
 P. H. Quanjer, G. J. Tammeling, J. E. Cotes, O. F. Pedersen, R. Peslin and J. C. Yernault, “Lung Volumes and Forced Ventilatory Flows. Report Working Party Standardization of Lung Function Tests, European Community for Steel and Coal. Official Statement of the European Respiratory Society,” European Respiratory Journal Supplement, Vol. 16, 1993, pp. 5-40.
 S. Stanojevic, A. Wade and J. Stocks, “Reference Values for Lung Function: Past, Present and Future,” European Respiratory Journal, Vol. 36, No. 1, 2010, pp. 12-19. http://dx.doi.org/10.1183/09031936.00143209
 A. Fulambarker, A. S. Copur, A. Javeri, S. Jere and M. E. Cohen, “Reference Values for Pulmonary Function in Asian Indians Living in the United States,” Chest, Vol. 126, No. 4, 2004, pp. 1225-1233. http://dx.doi.org/10.1378/chest.126.4.1225
 B. Korotzer, S. Ong and J. E. Hansen, “Ethnic Differences in Pulmonary Function in Healthy Nonsmoking Asian-Americans and European-Americans,” American Journal of Respiratory and Critical Care Medicine, Vol. 161, No. 4, 2000, pp. 1101-1108. http://dx.doi.org/10.1164/ajrccm.161.4.9902063
 P. H. Quanjer, S. Stanojevic, T. J. Cole, X. Baur, G. L. Hall, B. H. Culver, P. L. Enright, J. L. Hankinson, M. S. Ip, J. Zheng and J. Stocks, “Multi-Ethnic Reference Values for Spirometry for the 3-95-yr Age Range: The Global Lung Function 2012 Equations,” European Respiratory Journal, Vol. 40, No. 6, 2012, pp. 1324-1343. http://dx.doi.org/10.1183/09031936.00080312
 F. Boutros-Toni, B. Pigearias, P. Konate and J. Lonsdor- fer, “Spirometric Reference Values in Black Females,” Bulletin Européen de Physiopathologie Respiratoire, Vol. 19, No. 4, 1983, pp. 331-338.
 P. Dufetel, B. Pigearias, J. Lonsdorfer, G. Derossi, C. Diaine and P. J. Faltot, “Spirometric Reference Values in Senegalese Black Adults,” European Respiratory Journal, Vol. 2, No. 4, 1989, pp. 352-358.
 E. Hnizdo, G. Churchyard and R. Dowdeswel, “Lung Function Prediction Equations Derived from Healthy South African Gold Miners,” Occupational and Environemental Medicine, Vol. 57, No. 10, 2000, pp. 698-705.
 T. M. Knudsen, O. Morkve, S. Mfinanga and J. A. Hardie, “Predictive Equations for Spirometric Reference Values in a Healthy Adult Suburban Population in Tanzania,” Tanzania Journal of Health Research, Vol. 13, No. 3, 2011, pp. 1-10. http://dx.doi.org/10.4314/thrb.v13i3.64540
 “Standardization of Spirometry, 1994 Update. American Thoracic Society,” American Journal of Respiratory and Critical Care Medicine, Vol. 152, No. 3, 1995, pp. 1107- 1136. http://dx.doi.org/10.1164/ajrccm.152.3.7663792
 W. Van Ganse, L. Billet and B. Ferris, “Medical Criteria for the Selection of Normal Subject,” In P. Arcangeli, J. E. Cotes and A. Cournand, Eds., Introduction to the Definition of Normal Values for Respiratory Function in Man, Panminerva Medica, Alghero, 1969.
 P. H. Quanjer, J. Stocks, T. J. Cole, G. L. Hall and S. Stanojevic, “Influence of Secular Trends and Sample Size on Reference Equations for Lung Function Tests,” European Respiratory Journal, Vol. 37, No. 3, 2011, pp. 658-664. http://dx.doi.org/10.1183/09031936.00110010
 M. R. Miller, P. H. Quanjer, M. P. Swanney, G. Ruppel and P. L. Enright, “Interpreting Lung Function Data Using 80% Predicted and Fixed Thresholds Misclassifies More than 20% of Patients,” Chest, Vol. 139, No. 1, 2011, pp. 52-59. http://dx.doi.org/10.1378/chest.10-0189
 S. Mukhopadhvay, K. A. Macleod, T. J. Ong and S. A. Ogston, “‘Ethnic’ Variation in Childhood Lung Function May Relate to Preventable Nutritional Deficiency,” Acta Paediatrica, Vol. 90, No. 11, 2001, pp. 1299-1303. http://dx.doi.org/10.1111/j.1651-2227.2001.tb01579.x
 M. Golshan, M. Nematbakhsh, B. Amra and R. O. Crapo, “Spirometric Reference Values in a Large Middle Eastern Population,” European Respiratory Journal, Vol. 22, No. 3, 2003, pp. 529-534. http://dx.doi.org/10.1183/09031936.03.00003603