Monthly solar radiation re-estimation in Shandong based on Angstrom-Prescott model and spatial interpolation 
WANG Ren-zheng, SHAN Zheng-duo, WANG Jian-xin, MENG He, GONG Xiang
Shandong Science . 2020, (3): 93 -99 .  DOI: 10.3976/j.issn.1002-4026.2020.03.014