Koshevoy, V. P., I. V. Furda, and M. I. Egorov. “Effect of N,N-Dimethylformamide, Ethylene Glycol and Their Mixture on Cryoresistance of Canine Spermatozoa”. Problems of Cryobiology and Cryomedicine, vol. 16, no. 3, Sept. 2006, pp. 245-53, https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/580.