1. Global initiative for Chronic Obstructive Lung Disease Global Strategy for Diagnosis, Management, and Prevention of COPD 2010 http://www.goldcopd.org/uploads/users/files/GOLDReport_April11%202011.pdf
2. An evaluation of salmeterol in the treatment of chronic obstructive pulmonary disease (COPD);Boyd;Eur Respir J,1997
3. Comparison of the efficacy, tolerability, and safety of formoterol dry powder and oral, slow-release theophylline in the treatment of COPD;Rossi;Chest,2002
4. Drugs@FDA FDA Approved Drug Products: Indacaterol http://www.accessdata.fda.gov/Scripts/cder/DrugsatFDA/index.cfm
5. EMA European Medicines Agency - Onbrez Breezhaler 2011 http://www.ema.europa.eu/ema/index.jsp?curl=pages/medicines/human/medicines/001114/human_med_001219.jsp