RT Journal Article SR Electronic T1 Exercise-induced asthma. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 571 OP 574 DO 10.1136/thx.34.5.571 VO 34 IS 5 A1 J P Hartley YR 1979 UL http://thorax.bmj.com/content/34/5/571.abstract AB