Conditions for division and multiplication of frequencies in ferrite Dmitriy Pleshev, Vladimir Vlasov, Fanur Asadullin, Leonid Kotov, Sergey Poleshchikov, Vladimir Shavrov and Vladimir Shcheglov EPJ Web Conf., 185 (2018) 02004 Published online: 04 July 2018 DOI: 10.1051/epjconf/201818502004