论文的二审意见回来后，里面有一条意见是这样的：“Please don’t use lumpy reference (such as: Li et al. 2013, Li et al. 2019, Zhang et al. 2018a, He et al. 2019). Each reference needs to be properly addressed. Please revise your paper accordingly since same issue occurs on several spots in the paper,”请问这里面的“lumpy reference”是指什么啊，这举的例子应该怎么修改？我之前参考文献修改过很多，初审意见里面就有这一条，改了很多，现在还是这样的问题，就不知道该怎么改了，求各位指点迷津！
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