1. Energy Balance of Ukraine for 2020
2. Retrospective Analysis of the Formation Process of the Gas Transport and Gas Distribution System of Ukraine as the Basis of the Identification and Solution of Their Main Problems Development
https://core.ac.uk/download/pdf/84123072.pdf
3. Current State and Problems of Development of the Gas Transportation System of Ukraine in the Context of European Integration Processes;Zapukhliak;East. Eur. Econ. Bus. Manag.,2017
4. Geography and Dynamics of Natural Gas Imports to Ukraine in 2020
https://ua-energy.org/uk/posts/zvidky-haz-heohrafiia-ta-dynamika-importu-pryrodnoho-hazu-ukrainoiu-u-2020-rotsi
5. Official Website of Ukrtransgaz
https://tsoua.com/news/za-pidsumkamy-10-misyacziv-import-gazu-z-yes-v-ukrayinu-perevyshhuye-eksport/