Gravitational lensing around Kehagias–Sfetsos compact objects surrounded by plasmaSudipta Hensh, Ahmadjon Abdujabbarov, Jan Schee and Zdeněk StuchlíkEur. Phys. J. C, 79 6 (2019) 533DOI: https://doi.org/10.1140/epjc/s10052-019-7034-7