The Comparative Advantages and Structure Adjustment about Crop Planting in Main Grain Producing Areas ——An Empirical Analysis Based on Hebei Province
FENG Xue-qin
JOURNAL OF HEBEI UNIVERSITY (Philosophy and Social Science) . 2018, (2): 103 -109 .  DOI: 10.3969/j.issn.1005-6378.2018.02.014