PHASE FORMATION AND PHYSICOCHEMICAL PROPERTIES OF PEROVSKITE COMPLEX OXIDES BASED ON BISMUTH FERRITE Article Tsyrulnikova N.V., Kashirina M.A., Fortalnova E.A., Safronenko M.G., Politova E.D., Venskovskii N.U. Russian Journal of Inorganic Chemistry. IAPC Nauka/Interperiodica. Vol. 57. 2012. P. 28-32