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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 https://www.jnr.ac.cn/EN/10.11849/zrzyxb.2009.11.014
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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 https://www.jnr.ac.cn/EN/10.11849/zrzyxb.2009.11.014
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