RT Journal Article SR Electronic T1 The value of routine expiratory chest films in the diagnosis of pneumothorax. JF Archives of Emergency Medicine JO Arch Emerg Med FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 115 OP 116 DO 10.1136/emj.8.2.115 VO 8 IS 2 A1 M Bradley A1 C Williams A1 M J Walshaw YR 1991 UL http://emj.bmj.com/content/8/2/115.abstract AB