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Farrell, J., Grierson, D.J., Patel, S. and Sturrock, R.D. (1992) A Classification for Dry Eyes Following Comparison of Tear Thinning Time with Schirmer Tear Test. Acta Ophthalmologica (Copenh), 70, 357-360.
http://dx.doi.org/10.1111/j.1755-3768.1992.tb08579.x

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