RETRACTED: Application of vitamin B12, vitamin E and trace element selenium during the period of preparation of sturgeon producers for spawningElena Ponomareva, Angelika Kovalevа, Yulia Shirina, Vadim Grigoriev, Anton Kuzov and Angelina FirsovaBIO Web Conf., 138 (2024) 01017DOI: https://doi.org/10.1051/bioconf/202413801017