Water-based exercise in COPD with physical comorbidities: a randomised controlled trial

Eur Respir J. 2013 Jun;41(6):1284-91. doi: 10.1183/09031936.00034312. Epub 2012 Sep 20
McNamara RJ1, McKeough ZJ, McKenzie DK, Alison JA.

https://www.ncbi.nlm.nih.gov/pubmed/22997217