TY  - RPRT
TI  - Ipratropium bromide: an additive effect?
AU  - R L Henry
PY  - 1990
DO  - 10.1111/j.1440-1754.1990.tb02407.x
UR  - https://pubmed.ncbi.nlm.nih.gov/1976324/
ID  - 1976324
ER  -