October 8, 2017. The paper The closer the better: Similarity of publication pairs at different co-citation levels by Giovanni Colavizza, Kevin Boyack, Nees Jan van Eck, and Ludo Waltman has been accepted for publication in the Journal of the Association for Information Science and Technology.
September 14, 2017. The slides of the presentation that I gave today at the ALPSP 10th Annual Conference and Awards in Noordwijk are available here.
June 28, 2017. The slides of the presentation that I gave today at the 2017 BenchTech Seminar at the Technical University Munich in Munich are available here.
May 29, 2017. The slides of the presentation that I gave today at the Workshop: "University rankings: A challenge of a foe?" at the University of Milan in Milan are available here.
May 20, 2017. The paper Framing psychology as a discipline (1950-1999): A large-scale term co-occurrence analysis of scientific literature in psychology by Ivan Flis and Nees Jan van Eck has been accepted for publication in History of Psychology.
May 17, 2017. The CWTS Leiden Ranking 2017 has been released and is available at www.leidenranking.com. Ten principles for the responsible use of university rankings are presented in this blog post.
March 30, 2017. The slides of the presentation that I gave today at the EXCITE Workshop 2017: "Challenges in Extracting and Managing References" at GESIS - Leibniz Institute for the Social Sciences in Cologne are available here.
April 24, 2017. The paper Citation-based clustering of publications using CitNetExplorer and VOSviewer by Nees Jan van Eck and Ludo Waltman has been published in volume 111, issue 2 of Scientometrics.
My research focuses primarily on the bibliometric mapping of scientific fields (various maps that I have constructed can be found here). I have written a PhD thesis on this topic. Another research interest that I have, which is somewhat separate from the rest of my work, is the construction and analysis of bibliometric performance indicators. In most of my research I am working closely together with Ludo Waltman.