RT Journal Article SR Electronic T1 A long-term study of threshold values and output characteristics of cardiac pacemakers. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 63 OP 69 DO 10.1136/thx.22.1.63 VO 22 IS 1 A1 Járos, G G A1 Marchand, P A1 Milner, M A1 Obel, I W YR 1967 UL http://thorax.bmj.com/content/22/1/63.abstract AB