Chetvertakova Е. V., and Y. V. Abaza. “Qualitative Indicators of Sperm Bulls of Spermogonial Jsc ‘krasnoyarskugol’”. Mongolian Journal of Agricultural Sciences, vol. 22, no. 03, May 2018, pp. 26-28, doi:10.5564/mjas.v22i03.945.