Zero Drift and Solid Earth Tide Extracted from Relative Gravimetric Data 
with Principal Component Analysis
YU Hongjuan,GUO Jinyun,LI Jiulong,MU Dapeng,KONG Qiaoli
jgg . 2015, (5): 906 -910 .  DOI: 10.14075/j.jgg.2015.05.040