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by gus_massa 528 days ago
I agree, also many papers near the begining say

> We are exending our previous work in [7]

or cite a few relevant papers

> This topic has been studied in [3-8]

Where 3 was published by group X, 5 by group Y, 7 by group Z and 4, 6 and 8 by group W. Anyone can guess the author of the paper is in group W.

Just looking at the citations, it's easy to guess the group of the author.