RT Journal Article SR Electronic T1 Reference values for maximal work capacity in healthy children JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 791 OP 791 DO 10.1183/09031936.98.11030791 VO 11 IS 3 A1 JE Cotes A1 VA Gulmans A1 K de Meer A1 JW Reed YR 1998 UL http://erj.ersjournals.com/content/11/3/791.abstract AB