STUDY OF ANOMALIES OF RARE GASES IN SEVERAL WELLS IN NORTH CHINA
ZHANG Pei-ren, LIU Cheng-long, WANG Zhi-min, TAO Jing-ling, YANG Hai-xiang, YANG Zhu-zhuan, MENG Cai-ju
SEISMOLOGY AND GEOLOGY . 2002, (2): 215 -222 .