AU  - Campbell S
TI  - FOr copd a combination of ipratropium bromide and albuterol sulfate is more effective than albuterol base
PT  - JOUR
DP  - 1999
TA  - Archives of Internal Medicine
pages = {156-160},
VI  - 159
IP  - 2
AID  - 10.1001/archinte.159.2.156 [doi]
4100  - http://dx.doi.org/10.1001/archinte.159.2.156
SO  - Archives of Internal Medicine January 25, 1999 159(2):156