RT Journal Article SR Electronic T1 KERATITIS SICCA JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 61 OP 65 DO 10.1136/bjo.14.2.61 VO 14 IS 2 A1 W. S. Duke-Elder YR 1930 UL http://bjo.bmj.com/content/14/2/61.abstract AB