RT Journal Article SR Electronic T1 Reference values for spirometry of the European Coal and Steel Community: time for change JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 687 OP 688 DO 10.1183/09031936.00145507 VO 31 IS 3 A1 P. Degens A1 R. Merget YR 2008 UL http://erj.ersjournals.com/content/31/3/687.2.abstract AB