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It is very difficult. When I took the course given by Fujita, my classmates said the thoery was so amazing that only god can understand.We can discuss about it.
《垄断竞争和产品专业化》,模型分析可见杨小凯的发展经济学或经济数学方法模型
<空间经济学>有讲,不过LZ最好还是下载原文,可能会好些