HUCHTEMANN, Dirk. Efficiency gain through regionalization? Demarcation of homogeneous policy action areas in river catchment areas. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 65, n. 3, p. 186–194, 2007. DOI: 10.1007/BF03184544. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1315. Acesso em: 15 aug. 2026.