Razanova, O. P., Y. I. Shulha, and O. O. Saliuk. “PRODUCTIVITY OF BEE FAMILIES IN THE PERIOD OF PREPARATION FOR THE MAIN MEDICATION UNDER THE INFLUENCE OF A PROBIOTIC”. Bulletin of Sumy National Agrarian University. The Series: Livestock, no. 2, Sept. 2022, pp. 61-67, doi:10.32845/bsnau.lvst.2022.2.9.