Videv, E., et al. “PRODUCTION NITROUS OXIDE (N2O) IN DIGESTIVE PROCESSES OF RUMINANTS AND THE POSSIBILITY OF ITS REDUCTION”. Bulgarian Journal of Animal Husbandry, vol. 51, no. 5, Oct. 2014, pp. 64-71, https://agriacad.eu/ojs/index.php/bjah/article/view/461.