RT Journal Article SR Electronic T1 Investigative use of bronchoscopy, lavage and bronchial biopsies in asthma and other airways diseases JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 115 OP 121 VO 5 IS 1 YR 1992 UL http://erj.ersjournals.com/content/5/1/115.abstract AB