Chin. Phys. B
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Chin. Phys. B  2015, Vol. 24 Issue (3): 030201    DOI: 10.1088/1674-1056/24/3/030201
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Nonlocal symmetries and negative hierarchies related to bilinear Bäcklund transformation
Hu Xiao-Ruia, Chen Yongb
a Department of Applied Mathematics, Zhejiang University of Technology, Hangzhou 310023, China;
b Shanghai Key Laboratory of Trustworthy Computing, East China Normal University, Shanghai 200062, China

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