[1] Davenport, C. B. Effect of chemical and physical agents upon protoplasm. Macmillan and Co., New York. 1897.

[2] Polge, C., and Parkes, A. S. Possibilities of long-term storage of spermatozoa at low temperatures. Anim. Breeding Abs. 20:1-5. 1952.

[3] Emmens, C. W., and Blackshaw, A. W. The low temperature storage of ram, bull, and rabbit spermatozoa. Austral. Vet. Jour. 26:226. 1950.

[4] Smith, Audrey W. Effects of low temperatures on living cells and tissues. In biological applications of freezing and drying. Ed. R. J. C. Harris. Academic Press, Inc., New York, 1954.

[5] Emmens, C. W., and Blackshaw, A. W. Artificial insemination. Physiol. Rev. 36:277-306. 1956.

[6] Proceedings of the National Association of Artificial Breeders, 1953, 1954, and 1955.

[7] Proceedings of the American Dairy Science Association, 1953, 1954, and 1955. Published in the June issue of the Journal of Dairy Science for each year.

[8] Barker, C. A. V. Low temperature preservation of bovine epididymal spermatozoa. Canad. Jour. Comp. Med. 18:390-393. 1954.

[9] Saroff, Jack, and Mixner, J. P. The relationship of egg yolk and glycerol content of diluters and glycerol equilibration time to survival of bull spermatozoa after low temperature freezing. Jour. Dairy Sci. 38:292-297. 1955.

[10] Cragle, R G., Myers, R. M., Waugh, R. K., Hunter, J. S., and Anderson, R. L. The effects of various levels of sodium citrate, glycerol, and equilibration time on survival of bovine spermatozoa after storage at -79° C. Jour. Dairy Sci. 38:508-514. 1955.

[11] Bratton, R. W., Foote, R. H., and Cruthers, Joan C. Preliminary fertility results with frozen bovine spermatozoa. Jour. Dairy Sci. 38:40-46. 1955.

[12] Hafs, H. D., and Elliott, F. I. The effects of methods of adding egg yolk and monosaccharides on the survival of frozen bull spermatozoa. Jour. Dairy Sci. 38:811-815. 1955.

[13] Miller, W. J., and VanDemark, N. L. The influence of glycerol level, various temperature aspects, and certain other factors on the survival of bull spermatozoa at sub-zero temperatures. Jour. Dairy Sci. 37:45-51. 1954.