Raźniak, P., S. Dorocki, T. RachwaÅ‚, and A. Winiarczyk-Raźniak. “Influence of Energy Sector Corporations on the Corporate Control Functions of Cities”. International Journal of Energy Economics and Policy, vol. 11, no. 2, Feb. 2021, pp. 333-40, https://www.econjournals.com/index.php/ijeep/article/view/10687.