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W. H. Qi

Hebei Normal University

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G.D. Tang

Hebei Normal University

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D.H. Ji

Hebei Normal University

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D. L. Hou

Hebei Normal University

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S. P. Liu

Hebei Normal University

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Q.J. Han

Hebei Normal University

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R.R. Bian

Hebei Normal University

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S.R. Liu

Hebei Normal University

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Wei Chen

Hebei Normal University

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Z. Z. Li

Hebei Normal University

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X. Zhao

Hebei Normal University

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