PHASE FORMATION AND PHYSICOCHEMICAL PROPERTIES OF PEROVSKITE COMPLEX OXIDES BASED ON BISMUTH FERRITE ArticleTsyrulnikova N.V., Kashirina M.A., Fortalnova E.A., Safronenko M.G., Politova E.D., Venskovskii N.U.Russian Journal of Inorganic Chemistry. Том 57. 2012. С. 28-32