Dept. Math. and Info. Science, Zhengzhou Univ. of Light Industry, Zhengzhou 450002, China
Dept. Computer Science & Engineering, Henan Institute of Engineering, Zhengzhou 451191, China

Copyright © Hailiang Shi, Tao Wei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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