Spatial and Temporal Variation Characteristics of the Four Seasons in the Northern China
YAN Deng-Hua, GENG Si-Min, LUO Xian-Xiang, QIN Tian-Ling
SCIENTIA GEOGRAPHICA SINICA . 2011, (9): 1105 -1110 .  DOI: 10.13249/j.cnki.sgs.2011.09.1105