"2017 ERS/ATS standards for single-breath carbon monoxide uptake in the lung." Brian L. Graham, Vito Brusasco, Felip Burgos, Brendan G. Cooper, Robert Jensen, Adrian Kendrick, Neil R. MacIntyre, Bruce R. Thompson and Jack Wanger. Eur Respir J 2017; 49: 1600016. Issue 5 (22nd November 2018) - Unknown