RT Journal Article SR Electronic T1 Waller--pioneer of electrocardiography. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 61 OP 64 DO 10.1136/hrt.42.1.61 VO 42 IS 1 A1 E Besterman A1 R Creese YR 1979 UL http://heart.bmj.com/content/42/1/61.abstract AB