Wei, Li Zhou with Zhou Yong, "Study on the Model for Regional Programming", 1991
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The study on the development of the region is an enormous systematical project. Therefore, the quantitative method must be used in integrating with the qualitative method to study it. As the conditions and the scopes adaptable to various quantitative methods of study are not the same, the level of solving problems is limited and it would be difficult to reach the goal of studying the regional programming if only one certain method is used.