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. 2022 Nov 23;10:1002265. doi: 10.3389/fpubh.2022.1002265

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Copyright © 2022 Mahrouseh, Lovas, Njuguna, Nellamkuzhi, Soares Andrade, Sackey, Irawan and Varga.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Snapshots of the interactive heatmap of the most commonly used EuroVoc terms over the years. Legend, The heatmap contains domains and subdomains in the columns and years in the rows. The interactive heatmap allows users filtering by years, domains and subdomains. Snapshot (1) represents the heatmap covering EuroVoc terms from 1973 to 2021, (2) from 2013 to 2021, (3) from 2003 to 2013, (4) from 1993 to 2003, (5) from 1983 to 1993 and (6) from 1973 to 1983. The colors indicate the number of EuroVoc terms. The interactive heatmap is available at the following link: https://eu.spotfire-next.cloud.tibco.com/spotfire/wp/OpenAnalysis?file=4499a74c-a743-4844-bde1-81b018f81f96.