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4Beyers,W B1976."Empirical Identification of Key Sectors:Some Further Evidence."Environment and planning A No.8,pp.231-236.
5Miller,R E.1986."Upper Bounds on the sizes of Interregional Feedbacks in Multiregional Input-Output Modes."Joual of Regional Science,26 ,pp.285-306.
6Miller, R E and M L Lahr.2001."A Taxonomy of Extractions." Chapter21 in lahr,M L and R E Miller(eds), Regional Science Perspectives in Economic Analysis:A Festschrift in Memory of Benjamin H.Stevens(Contributions to Economic Analysis)North-Holland,Netherlands.
7Leontief, W 1953. "dynamic analysis". in Studies in the Strcture of the American Economy, Chapter 3,pp.53-90. New York:Oxford University Press.
8Rasmussen, P N 1956.Strdies in Intersectoral Relations.Amsterdam:North-Holland.
