1. Separation of X and Y spermatozoa;Beatty;Bibliogr. Reprod.,1974
2. New developments in reproductive physiology and their consequences for animal breeding;Cunningham;Dtsch. Tieraerztl. Wochenschr.,1974
3. Income over investment in semen;Everett;J. Dairy Sci.,1975
4. Breeding consequences of sex control in artificial insemination of cattle;Skjervold,1972