RT Journal Article SR Electronic T1 Cowpox virus. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 510 DO 10.1136/bjo.76.8.510 VO 76 IS 8 A1 W N Dugmore A1 Z M Dabir YR 1992 UL http://bjo.bmj.com/content/76/8/510.1.abstract AB