RT Journal Article SR Electronic T1 AN ADVOCACY OF EXTERNAL DACRYOCYSTORHINOSTOMY JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 183 OP 187 DO 10.1136/bjo.33.3.183 VO 33 IS 3 A1 F. N. Shuttleworth YR 1949 UL http://bjo.bmj.com/content/33/3/183.abstract AB