Influence of mode competition and external wave frequency modulation on gyrotron frequency lockingYu.V. Novozhilova, V.L. Bakunin, A.V. Chirkov, Yu.M. Guznov, G.G. Denisov, A.P. Fokin, A.S. Shevchenko, N.I. Zaitsev and S.A. ZapevalovEPJ Web Conf., 149 (2017) 04021DOI: https://doi.org/10.1051/epjconf/201714904021