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2. In vitro spontaneous motility of the human vas deferens;Ventura;Physiologist,1970
3. Freund, M., and Davis, J. E. Unpublished data.
4. Disappearance rate of spermatozoa from the ejaculate following vasectomy;Freund;Fertil Steril,1969
5. Techniques and complications of elective vasectomy;Schmidt;Fertil Steril,1966