NHG-Standaard COPD: Behandeling (Guide lines of the Dutch College of General Practitioners: Chronic Obstructive Respiratory Diseases: Therapy) - Geijer, RMM; van Schayck, CP; van Weel, C; Sachs, APE; van der Zwan, AAC; Bottema, BJAM (Huisarts en wetenschap, 1997)
et al