【作者(必填)】
Albert De Vaal1, Marianne Van Den Berg2
【文题(必填)】
Producer Services, Economic Geography, and Services Tradability
【年份(必填)】
Journal of Regional Science Volume 39, Issue 3, pages 539–572, August 1999
【全文链接或数据库名称(选填)】
http://onlinelibrary.wiley.com/doi/10.1111/0022-4146.00148/abstract