Steblyanskaya A., Wang Z., Bragina Z. (2018). Corporate finance for sustainability: China oil and gas industry optimum financial g th and system balance indices application results. System analysis in economics – 2018: Proceedings of the V International research and practice conference–biennale (21–23 november 2018). Moscow, Prometheus publishing house, pp. 203-208. DOI: 10.33278/SAE-2018.e..