RT Journal Article SR Electronic T1 Reference equations for specific airway resistance in children: the asthma UK initiative JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00135909 A1 J. Kirkby A1 S. Stanojevic A1 L. Welsh A1 S. Lum A1 M. Badier A1 C. Beardsmore A1 A. Custovic A1 K. Nielsen A1 J. Paton A1 W. Tomalak A1 J. Stocks YR 2010 UL http://erj.ersjournals.com/content/early/2010/02/11/09031936.00135909.abstract AB