SHORT-IMPENDING TILT EARTH TIDE VARIATION FEATURES OF CZB-1 PERPENDICULAR PENDULUM IN YANSHOU SEISMIC STATION OF HEILONGJIANG
LI Ji-ye, HU Bin-sheng, QU Yong-bin, SHI Wei, LI Guo-qing
SEISMOLOGY AND EGOLOGY . 2007, (3): 648 -656 .