RT Journal Article SR Electronic T1 STUDIES ON DEVELOPING RETINAL VESSELS JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 257 OP 276 DO 10.1136/bjo.46.5.257 VO 46 IS 5 A1 Norman Ashton A1 Christopher Pedler YR 1962 UL http://bjo.bmj.com/content/46/5/257.abstract AB