N. T. Serafy

Lack of standardization in performance of the semen analysis among laboratories in the United States.

B. A. Keel, T. W. Stembridge, Gilbert Pineda, 2001, Fertility and sterility.

Results of the American Association of Bioanalysts national proficiency testing programme in andrology.

B. A. Keel, B A Keel, P Quinn, 2000, Human reproduction.