EN中文
Analysis on the fluctuation of grain output in Hebei Province and its causes at multi-time and space of scale based on empirical mode decomposition method
LI Xin-wang, WANG Shu-tao, MEN Ming-xin, QI Yue-pu, XU Hao
JOURNAL OF NATURAL RESOURCES . 2009, (11): 1994 -2004 .  DOI: 10.11849/zrzyxb.2009.11.014