V. Kostishyn, I. Isaev, S. Shcherbakov, A. Nalogin, E. Belokon, and A. Bryazgin, “Obtaining anisotropic hexaferrites for the base layers of microstrip shf devices by the radiation-thermal sintering”, EEJET, vol. 5, no. 8 (83), pp. 32–39, Oct. 2016.