April 27, 2023. The paper Academic information retrieval using citation clusters: In-depth evaluation based on systematic reviews by Juan Pablo Bascur, Suzan Verberne, Nees Jan van Eck, and Ludo Waltman has been published in volume 128 of Scientometrics.
February 21, 2023. The blog post The preprint revolution - Implications for bibliographic databases by Ludo Waltman and Nees Jan van Eck has been published on Upstream.
January 23, 2023. VOSviewer version 1.6.19 has been released and is available for download. This new version offers a number of improvements in VOSviewer's support for creating maps based on OpenAlex data. It also fixes some problems in creating maps based on Web of Science data.
January 2, 2023. The paper Capillary electrophoresis - A bibliometric analysis by Magnus Palmblad, Nees Jan van Eck, and Jonas Bergquist has been published in volume 159 of TrAC Trends in Analytical Chemistry.
December 7, 2022. The blog post Take responsibility for social media by Vincent Traag, Jonathan Dudek, Eleonora Dagiene, Nees Jan van Eck, and Rodrigo Costas has been published on Leiden Madtrics.
November 1, 2022. The paper Funding COVID-19 research: Insights from an exploratory analysis using open data infrastructures by Alexis-Michel Mugabushaka, Nees Jan van Eck, and Ludo Waltman has been published in volume 3, issue 3 of Quantitative Science Studies.
August 29, 2022. networkanalysis-ts version 1.0.0 has been released. The networkanalysis-ts package is a TypeScript port of the Java networkanalysis package. The package provides algorithms and data structures for network analysis. It contains an implementation of the Leiden algorithm and the Louvain algorithm for network clustering and the VOS technique for network layout.
July 12, 2022. The slides of the online presentation The evolving landscape of scholarly metadata: Preprints and open peer reviews that Ludo Waltman and I gave today at the CWTS Research Seminar are available here.
July 7, 2022. The paper Crossref as a source of open bibliographic metadata by Nees Jan van Eck and Ludo Waltman has been published on MetaArXiv.
July 7, 2022. The paper Academic information retrieval using citation clusters: In-depth evaluation based on systematic reviews by Juan Pablo Bascur, Suzan Verberne, Nees Jan van Eck, and Ludo Waltman has been published on arXiv.
July 6, 2022. The blog post The growth of open peer review by Ludo Waltman and Nees Jan van Eck has been published on Leiden Madtrics.
I am doing research in the field of bibliometrics and scientometrics. My research focuses primarily on the development of visualization tools and algorithms, mainly for analyzing the structure and development of science. I am the main developer of VOSviewer and CitNetExplorer, two well-known software tools for visualizing bibliometric data. The VOSviewer software is frequently used in bibliometric studies. More than 1500 publications have appeared in international scientific journals in which the software is employed. In addition to my work on bibliometric visualization, I also focus on the study of bibliometric data sources and the analysis of the full text of scientific publications. In most of my research I am working closely together with Ludo Waltman.