GRADZIUK, P. Economic Efficiency of Photovoltaic Installations (A Case Study at the Zwierzyniec–Biały Słup Research and Education Centre of Roztocze National Park). Regional Barometer. Analyses & Prognoses, [S. l.], v. 12, n. 4, p. 117–122, 2015. DOI: 10.56583/br.989. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/989. Acesso em: 22 nov. 2024.