2ZWEIFEL P, FELDER S, MEIERS M, et al. Ageing of poptdation and health care expenditure:A red herring? [J]. Journal of health economics, 1999,8:485 -496. 被引量:1
3WISE D A. The economies of Aging[M]. Chicago:The University of Chica- go Press, 1989. 被引量:1
4MARKUSEN J R. Trade in producer services and in other specialized inter- mediate inputs[ J]. American economic review,1989,79( 1 ) :85 -95. 被引量:1
5GLAESER E. Learning in cities[J]. Journal of urban economics,1999,46 (2) :254 -277. 被引量:1