求助sage journals online上两篇文献，谢谢了！


Network Urban Structures in Northern Italy: Elements for a Theoretical Framework
Roberto P. Camagni; Carlo Salone
Urban Studies, 1360-063X, Volume 30, Issue 6, 1993, Pages 1053 – 1064

Information Technology Consultancy Firms: Economies of Agglomeration from a Wide-area Perspective
Frank Moulaert ; Faridah Djellal
Urban Studies, Vol. 32, No. 1, 105-122 (1995)