9Park S. H. & Chan K. S. A Cross - country input -output Analysis of Intersectoral Relationships Between Manufacturing and Services and Their Employment Implications [ J ]. World Development,1989,17(2) :199 -212.
10O'Farrell, P. N. , Hitchens, D. M. W. N. Producer services and regional development :a review of some major conceptual policy and research issues [ J]. Environment and planning A, 1990 (22) :1141 - 1154.