For citations:
Ariel B.M., Barshtein Yu.A. Methodology of pneumonia studies (the experience of two centuries). PULMONOLOGIYA. 1991;(1):56-58. (In Russ.)
Ariel B.M., Barshtein Yu.A. Methodology of pneumonia studies (the experience of two centuries). PULMONOLOGIYA. 1991;(1):56-58. (In Russ.)