TY  - RPRT
TI  - Dose response of ipratropium assessed by two methods.
AU  - C J Allen
AU  - A H Campbell
PY  - 1980
DO  - 10.1136/thx.35.2.137
UR  - https://pubmed.ncbi.nlm.nih.gov/6445607/
ID  - 6445607
ER  -