Notice of RetractionThree-dimensional frame of agglomeration economy: The development strategy of city group under global production network

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

Information technology highly developed, industrial organization reformed, industrial value chain being divided and reassembled and global production network is forming. City group formation and development face new economic environment. The paper advance a three-dimension research frame of agglomeration economy including spatial agglomeration, industrial agglomeration and value section agglomeration of region enchasing in global production network, and city group development strategy based on the three-dimension frame of agglomeration economy.