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Robbins SG, Rajaratnam VS, Penn JS.Robbins SG, et al. Among authors: penn js.Growth Factors. 1998;16(1):1-9. doi: 10.3109/08977199809017487.Growth Factors. 1998.PMID: 9777366
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Penn JS, Rajaratnam VS.Penn JS, et al.Invest Ophthalmol Vis Sci. 2003 Dec;44(12):5423-9. doi: 10.1167/iovs.02-0804.Invest Ophthalmol Vis Sci. 2003.PMID: 14638747
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Penn JS, Rajaratnam VS, Collier RJ, Clark AF.Penn JS, et al.Invest Ophthalmol Vis Sci. 2001 Jan;42(1):283-90.Invest Ophthalmol Vis Sci. 2001.PMID: 11133880