  In countries like Denmark and Spain classified journal lists are now being
produced and used in the calculation of nationwide performance indicators. As a
result, Danish and Spanish scholars are advised to contribute to journals of
high 'authority' (as in the former) or those within a high class (as in the
latter). This can create a few problems. The aim of this paper is to analyse
the potential use of network centrality measures to identify possible
mismatches of journal categories. It analysis the Danish National Authority
List and the Spanish CIRC Classification. Based on a sample of Library and
Information Science publications, it analyses centrality measures that can
assess on the importance of journals to given fields, correcting mismatches in
these classifications. We conclude by emphasising the use of these measures to
better calibrate journal classifications as we observe a general bias in these
lists towards older journals. Centrality measures can allow to identify
periphery-to-core journals' transitions.

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