SELLE, Klaus; SINNING, Heidi. Projects and Strategies for developing open spaces in Urban regions: The „Green Rings” of Leipzig and Hanover. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 58, n. 2-3, p. 222–232, 2000. DOI: 10.1007/BF03185192. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1148.. Acesso em: 27 apr. 2024.