%0 Conference Article %T Preparation of magnetite nanoparticles doped with molybdenum, tantalum, vanadium, and niobium and their catalytic properties by the example of the Michael reaction %A Larina, V.V. %A Deryabina, E.A. %A Chupakhin, E.G. %K %J ChemBioSeasons 2022 %D 2022 %P 0 %I Kemerovo State University