Matveev, Daniyl Yu. “Mass Spectrometry As an Effective Method for Measuring the Concentration of Donor Impurities in Bismuth Films”. Ecological Bulletin of Research Centers of the Black Sea Economic Cooperation, vol. 18, no. 1, Mar. 2021, pp. 46-54, https://doi.org/10.31429/vestnik-18-1-46-54.