1. Statistical Review of World Energy. 2020, No. 69th Ed., London, UK, 2020, 68 pp.
2. M. Kh. Sosna, M. V. Kryuchkov, et al., Neftegazokhimiya, No. 3-4, 21-23 (2020).
3. Economic Commission for Europe, Committee on Sustainable Energy. Thirty-first Session. Item 6 of the Draft Agenda: Enabling a Hydrogen Ecosystem. Terminology, Classification and Taxonomy of Hydrogen [in Russian], Geneva, Switzerland, 2022, 19 pp.
4. S. P. Filippov, A. E. Golodnitskii, and A. M. Kashin, Energ. Polit., No. 11 (153), 28-39 (2020).
5. D. R. Shafiev, A. N. Trapeznikov, et al., Usp. Khim. Khim. Tekhnol., No. 12 (235), 53-57 (2020).