Improved urban gravity model based evaluation for socioeconomic adaptability of freeways-taking Ningwu Freeway as an example
HU Jin-bao，MENG Xiao-yu，GAO Wei-dong
SHANDONG SCIENCE . 2016, (4): 68 -74 .  DOI: 10.3976/j.issn.1002-4026.2016.04.014

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