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Mahler, D. A., D'Urzo, A., Bateman, E. D., Özkan, S. A., White, T., Peckitt, C., Lassen, C., Kramer, B., & , (2012). concurrent use of indacaterol plus tiotropium in patients with COPD provides superior bronchodilation compared with tiotropium alone: a randomised, double-blind comparison. Thorax, 67(9), 781–788. http://access.bl.uk/ark:/81055/vdc_100137792820.0x00002f