References

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6: Am J Obstet Gynecol. 2000 May;182(5):1013-5.Type 5 phosphodiesterase regulation of human sperm motility. Cuadra DL1, Chan PJ, Patton WC, Stewart SC, King A.
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8: Correlation Between Intact Sperm Acrosome Assessed Using the Spermac Stain and Sperm Fertilizing Capacity P. J. Chan, J. U. Corselli, J. D. Jacobson, W. C. Patton & A. King

9: Paulenz, H., Grevle, I., Berg, K. A. and Thomassen, R. (1995), The Use of a Dichromatic Stain Method (Spermac®) for Determining Changes in the Acrosomal Integrity of Boar Semen during Cryopreservation. Reproduction in Domestic Animals
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