A. A. Breslavets, Li Rong, Zhu Gang, O. A. Voitovich, , O. I. Shubny, V. V. Glamazdin, M. P. Natarov, G. O. Rudnev, Z. E. Eremenko, and A. A. Prokopenko, Hemispherical X band microwave small sized open resonator for wide range from 1 to 20 permittivity characterization of solid-state dielectrics, Low Temp. Phys. 48, (2021) [Fiz. Nyzk. Temp. 48, 48-55, (2021)] DOI: https://doi.org/10.1063/10.0008963.