@ARTICLE {33423, author={A. Fallah and Y. Kiasat and M. G. Silveirinha and N. Engheta}, doi={10.1103/PhysRevB.103.214303}, journal={Physical Review B - Condensed Matter and Materials Physics}, title={Nonreciprocal guided waves in the presence of swift electron beams}, year={2021}, month={June}, volume={103}, number={21}, pages={1-8}, ISSN={2469-9950} }