RT Journal Article SR Electronic T1 THE LESS COMMON FORMS OF PULMONARY HYPERTENSION JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 197 OP 217 DO 10.1136/hrt.21.2.197 VO 21 IS 2 A1 William Evans YR 1959 UL http://heart.bmj.com/content/21/2/197.abstract AB