TY  - RPRT
TI  - [Unsolved problems in the classification of bronchial asthma].
AU  - P N Iurenev
AU  - N I Semenovich
AU  - A G Chuchalin
PY  - 1971
UR  - https://pubmed.ncbi.nlm.nih.gov/5159915/
ID  - 5159915
ER  -