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2. A one-minute live-dead sperm stain by means of eosin and nigrosin;Blom;J. Fertil. & Steril.,1950
3. Kurzrok, R.: Cervical factor in infertility. Modern Med., p. 103, May 15, 1953.
4. Sperm survival at estimated ovulation time: Prognostic significance;Stein;J. Fertil. & Steril.,1950
5. Williams, W.: Significance of the semen examination. Modern Med., p. 81, May 15, 1953.