FRIEDRICHS, Jürgen. Environmental problems in an industrial agglomeration: Strategies for solutions from natural science and socio-economic implications at the University of Cologne the special research area 419. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 58, n. 6, p. 499–511, 2000. DOI: 10.1007/BF03182995. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1190.. Acesso em: 18 mar. 2025.