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Oscillation criteria for first order neutral differential equations with positive and negative coefficients 其他
2001-01-01
Zhang, XS; Yan, JR
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Extraction of scandium from ion-adsorptive rare earth deposit by naphthenic acid 其他
2001-01-01
Liao, CS; Jia, JT; Zhang, Y; Xu, G; Yan, CH; Li, BG; Xu, GX
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