المؤلفون: Du Vall, C. H.

المصدر: Archives of Ophthalmology ; volume 69, issue 3, page 418-418 ; ISSN 0003-9950

الاتاحة: http://dx.doi.org/10.1001/archopht.1963.00960040424029
https://archopht.jamanetwork.com/ama/content_public/journal/ophth/17694/archopht_69_3_029.pdf