Magnetodielectric effect and spin state of iron ions in iron-substituted bismuth pyrostannateLubov Udod, Sergey Aplesnin, Maxim Sitnikov, Oxana Romanova, Oleg Bayukov, Alexander Vorotinov, Dmitriy Velikanov and Gennadiy PatrinEur. Phys. J. Plus, 135 10 (2020) 776DOI: https://doi.org/10.1140/epjp/s13360-020-00781-2