Sereda, I., Y. Hrechko, and I. Babenko. “The Plasma Parameters of Penning Discharge With Negatively Biased Metal Hydride Cathode at Longitudinal Emission of H– Ions”. East European Journal of Physics, no. 3, Sept. 2021, pp. 81-86, doi:10.26565/2312-4334-2021-3-12.