Authors: van Noord, JA de Munck, DRAJ Bantje, TA Hop, WCJ Akveld, MLM Bommer, AL

Citation: Ja. Van Noord et al., Long-term treatment of chronic obstructive pulmonary disease with salmeterol and the additive effect of ipratropium, EUR RESP J, 15(5), 2000, pp. 878-885