[5] Liu Y D, Sun X D, Zhou J M, et al. Mathematical and Computer Modelling, 2010, (51): 1438.
[6] Liu Y D, Sun X D, Dong X L, et al. American Scientific Publishers, 2011, 9(3): 1133.
[5] Liu Y D, Sun X D, Zhou J M, et al. Mathematical and Computer Modelling, 2010, (51): 1438.
[6] Liu Y D, Sun X D, Dong X L, et al. American Scientific Publishers, 2011, 9(3): 1133.
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