Attenuation of electromagnetic waves in an unmagnetized collisionless plasma by particle-in-cell methodDong-Ning Gao, Shu-Mei Lin and Wen-Shan DuanEur. Phys. J. Spec. Top., (2022) 1-5DOI: https://doi.org/10.1140/epjs/s11734-022-00633-3