TY  - RPRT
TI  - Combination bronchodilator therapy in COPD.
AU  - S I Rennard
PY  - 1995
DO  - 10.1378/chest.107.5_supplement.171s
UR  - https://pubmed.ncbi.nlm.nih.gov/7743822/
ID  - 7743822
ER  -