RT Journal Article SR Electronic T1 Unilateral Obliteration of the Pulmonary Artery in Emphysema JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 82 OP 84 DO 10.1136/thx.14.1.82 VO 14 IS 1 A1 Stevenson, J. G. A1 Reid, J. M. YR 1959 UL http://thorax.bmj.com/content/14/1/82.abstract AB