TY  - RPRT
TI  - Beta-agonists and asthma.
AU  - H Booth
AU  - E H Walters
PY  - 1993
DO  - 10.1016/0140-6736(93)92400-n
UR  - https://pubmed.ncbi.nlm.nih.gov/7901617/
ID  - 7901617
ER  -