RT Journal Article SR Electronic T1 Airway smooth muscle relaxation. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 894 OP 901 DO 10.1136/thx.50.8.894 VO 50 IS 8 A1 A J Knox A1 A E Tattersfield YR 1995 UL http://thorax.bmj.com/content/50/8/894.abstract AB