RUSIELIK, R.; ZBARASZEWSKI, W. The efficiency of scientific and tourism activity of Polish National Parks with use DEA method. Economic and Environmental Studies, [S. l.], v. 14, n. 3 (31), p. 283–297, 2020. Disponível em: https://czasopisma.uni.opole.pl/index.php/ees/article/view/2883. Acesso em: 23 nov. 2024.