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The author would like to thank the hospitality and financial support of Max-Planck-Institut für Mathematik in Bonn during this research. This research is partially supported by the National Natural Science Foundation of China and by the Science Foundation of the University Doctoral Program of CNEC.
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Tan, SL. On the invariants of base changes of pencils of curves, II. Math Z 222, 655–676 (1996). https://doi.org/10.1007/BF02621887
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DOI: https://doi.org/10.1007/BF02621887