GREIF, Siegfried. The geography of patents: The spatial distribution of inventiveness in Germany. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 59, n. 2-3, p. 142–153, 2001. DOI: 10.1007/BF03184349. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1211.. Acesso em: 27 apr. 2024.