The 2 references without contexts in paper S. Avdeev N., С. Авдеев Н. (2015) “Можно ли улучшить прогноз у больных хронической обструктивной болезнью легких? // Is it possible to improve prognosis in patients with chronic obstructive pulmonary disease?” / spz:neicon:pulmonology:y:2015:i:4:p:469-476

Boushy S.F., Coates E.D., Prognostic valie of pulmonary function tests in emphysema: with special reference to arte\n rial blood studies.Am. Rev. Respir. Dis. 1964; 90: 553–563.
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Kanner R.E., Renzetti A.D., Stanish W.M. et al. Predictors of survival in subjects with chronic airflow limitation. Am. J. Med. 1983; 74: 249–255.
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