Generation of Ultrashort Microwave Pulses in Passive Mode-Locked Electron Oscillators with Homogeneous and Inhomogeneous Line BroadeningM. N. Vilkov, N. S. Ginzburg, I. V. Zotova and A. S. SergeevEPJ Web Conf., 195 (2018) 01020DOI: https://doi.org/10.1051/epjconf/201819501020