The spatio-temporal variations of frost-free period in China from 1951 to 2012
Xiaoju NING, Gangjun LIU, Lijun ZHANG, Xiaoyang QIN, Shenghui ZHOU, Yaochen QIN
Journal of Geographical Sciences . 2017, (1): 23 -42 .  DOI: 10.1007/s11442-017-1362-z