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Lawrenson, J. G., Edgar, D. F., Gudgeon, A. C., Burns, J. M., Geraint, M., & Barnard, N. A. (1993). a comparison of the efficacy and duration of action of topically applied proxymetacaine using a novel ophthalmic delivery system versus eye drops in healthy young volunteers.. British journal of ophthalmology, 77(11), 713–715. http://access.bl.uk/ark:/81055/vdc_100135154282.0x000041