Akbaş, A., M. Sari, Z. Usta, and M. Saatci. “A Field Study on Fertility Traits of Holstein Heifer and Cows Artificially Inseminated With Sexed Belgian Blue Sperm and Growth Characteristics of Crossbreed Belgian Blue × Holstein (F1) Male Calves”. Proceedings of the Bulgarian Academy of Sciences, vol. 75, no. 7, July 2022, pp. 1072-81, doi:10.7546/CRABS.2022.07.16.