1. The Effects of Various Levels of Sodium Citrate, Glycerol, and Equilibration Time on Survival of Bovine Spermatozoa After Storage at –79 C;Cragle;J. Dairy Sci.,1955
2. Freezing Bull Semen in Liquid Nitrogen Vapor Without Instrumentation;Forgason;J. Animal Sci.,1961
3. Kellgren, H. C, Patrick. T. E., Johnston, J. E., Branton, C, and D’Arensburg, G. F. Field Trial with Bovine Spermatozoa Frozen and Stored at –79 C. Annual Progress Report Research in Dairying. 1955.
4. Seasonal Variation in Fertility of Female Bovine;Kellgren;J. Dairy Sci.,1962
5. Freezability of Bovine Spermatozoa Cooled Rapidly with Liquid Nitrogen;Martig;J. Dairy Sci.,1963