%0 Journal Article %A Roger A. Hitchings %T Quantitative trabeculectomy %D 1983 %R 10.1136/bjo.67.1.67 %J British Journal of Ophthalmology %P 67-67 %V 67 %N 1 %U https://bjo.bmj.com/content/bjophthalmol/67/1/67.1.full.pdf