Spatial Distribution and Influencing Factors of Innovation Output in Beijing-Tianjin-Hebei Region ——Spatial Statistics and Econometric Analysis Based on 13 Cities
MEI Chang-chun, QI Xiao-li
JOURNAL OF HEBEI UNIVERSITY (Philosophy and Social Science) . 2019, (1): 108 -115 .  DOI: 10.3969/j.issn.1005-6378.2019.01.015