Response surface contour map and the 3D model under the interaction of two factors. (a) The 3D model of interaction between AB factors. (b) Contour map of interaction between AB factors. (c) The 3D model of interaction between AC factors. (d) Contour map of interaction between AC factors. (e) The 3D model of interaction between BD factors. (f) Contour map of interaction between BD factors.

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Development trend of spatial Gini coefficient of ice and snow sports...

Response surface contour map and the 3D model under the interaction of...

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There are great differences in the regional development of the ice and snow sports industry in China. Most scholars only pay attention to the labor-related data while ignoring the regional spatial differences when calculating the industrial agglomeration level. This study takes the development of the ice and snow sports industry in Heilongjiang Pro...

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