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2.
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3.
Montgomery, P.W., and von Haam , E.: A Study of the Exfoliative Cytology of Oral Leucoplakia, J. D. Res. 30: 260, 1951.
4.
Gates, 0., and Warren, S.: A Handbook for the Diagnosis of Cancer of the Uterus by the Use of Vaginal Smears, Cambridge, 1947, Harvard University Press, p. 182.