Kazemilari, M., Mohamadi, A., Mardani, A. and Streimikis, J. 2019. Network topology of renewable energy companies: minimal spanning tree and sub-dominant ultrametric for the American stock. Technological and Economic Development of Economy. 25, 2 (Feb. 2019), 168-187. DOI:https://doi.org/10.3846/tede.2019.7686.