RT Journal Article SR Electronic T1 Chronic progressive external ophthalmoplegia and pigmentary degeneration of the retina. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 302 OP 311 DO 10.1136/bjo.55.5.302 VO 55 IS 5 A1 P V Mills A1 D I Bowen A1 D S Thomson YR 1971 UL http://bjo.bmj.com/content/55/5/302.abstract AB