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• ↓ VOSviewer is a software tool for constructing and visualizing bibliometric networks. These networks may for instance include journals, researchers, or individual publications, and they can be constructed based on citation, bibliographic coupling, co-citation, or co-authorship relations. VOSviewer also offers text mining functionality that can be used to construct and visualize co-occurrence networks of important terms extracted from a body of scientific literature.
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"On August 31, an unauthorized party gained access to the VOSviewer website. As a result, a malicious version of the VOSviewer Windows executable was available for download on August 31 between 3:30 and 13:20 CEST. Only users who downloaded the Windows executable during this time period are at risk. If you did so, we strongly recommend deleting the downloaded file immediately, running a full antivirus scan, and taking any additional security precautions in accordance with your organization's security policy."

"The incident was detected quickly by the Security Operations Centre at Leiden University, and immediate mitigation measures were taken to contain the incident and limit its potential impact. A detailed investigation is currently ongoing in collaboration with cybersecurity partners, including SURFcert. Users who will be identified as downloaders or users of the malicious version will be notified directly."

"We will provide further updates as soon as more information becomes available. We sincerely apologize for the inconvenience and appreciate your understanding."

"VOSviewer version 1.6.21 was released on June 12, 2026. This version offers major improvements for querying OpenAlex data, including more robust error handling, support for API key authentication, and advanced search functionality across titles, abstracts, and full texts. Keyword co-occurrence maps based on OpenAlex data have been added. Concept co-occurrence maps based on OpenAlex data have been replaced by topic co-occurrence maps. Furthermore, querying of Europe PMC data has been enhanced with advanced search capabilities. Finally, Mac compatibility has been improved through native support for Apple Silicon Macs and better detection of installed Java distributions."

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VOSviewer is a software tool for constructing and visualizing bibliometric networks. These networks may for instance include journals, researchers, or individual publications, and they can be constructed based on citation, bibliographic coupling, co-citation, or co-authorship relations. VOSviewer also offers text mining functionality that can be used to construct and visualize co-occurrence networks of important terms extracted from a body of scientific literature.