RT Journal Article SR Electronic T1 Argon Laser Photocoagulation JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 501 OP 501 DO 10.1136/bjo.62.7.501-a VO 62 IS 7 A1 A. M. Hamilton YR 1978 UL http://bjo.bmj.com/content/62/7/501.2.abstract AB