LIEFNER, Ingo. German „Technologie- und Gründerzentren” and the regional knowledge base: An empirical analysis of companies in Lower Saxony. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 62, n. 4-5, p. 290–300, 2004. DOI: 10.1007/BF03184521. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1497. Acesso em: 15 aug. 2026.