We show that the invariant method [Pinski & Narin, 1976], recently axiomatised by Palacios-Huerta & Volij , and used to quality-rank academic journals is subject to manipulation: a journal can boost its performance by making additional citations to other journals.
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Kóczy, L.Á., Strobel, M. The invariant method can be manipulated. Scientometrics 81, 291–293 (2009). https://doi.org/10.1007/s11192-008-2134-4