RT Journal Article SR Electronic T1 The CO2 response: usefulness and uncertainties JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 611 OP 613 DO 10.1183/09031936.93.06050611 VO 6 IS 5 A1 WN Gardner YR 1993 UL http://erj.ersjournals.com/content/6/5/611.abstract AB