Atmospheric Methane Recorded in Ice Cores
XU Bai-qing, YAO Tan-dong, LIU Xian-qin, GUO Xue-jun
JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY . 2005, (3): 360 -367 .  DOI: 10.7522/j.issn.1000-0240.2005.0054