131 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of GöttingenDE9 papers
- Freie Universität BerlinDE3 papers
- GESIS - Leibniz Institute for the Social SciencesDE3 papers
- Hanken School of EconomicsFI3 papers
- German Centre for Higher Education Research and Science StudiesDE2 papers
- Max Planck Institute for Radio AstronomyDE2 papers
- University of CologneDE2 papers
- Bielefeld UniversityDE1 paper
- Centre National de la Recherche ScientifiqueFR1 paper
- Christian-Albrechts-Universität zu KielDE1 paper
- Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)DE1 paper
- Imperial College LondonGB1 paper
12 papers
Estimating transformative agreement impact on hybrid open access: A comparative large-scale study using Scopus, Web of Science and open metadata
Najko Jahn
This study compares open metadata from hoaddata, an openly available dataset based on Crossref, OpenAlex and the cOAlition S Journal Checker Tool, with proprietary bibliometric dat…
Analysis of the Publication and Document Types in OpenAlex, Web of Science, Scopus, PubMed and Semantic Scholar
Nick Haupka, Jack H. Culbert, Alexander Schniedermann +2
The assignment of document and publication types in scholarly databases plays an important role in bibliometrics, for example in decision-making or university rankings. However, sc…
How open are hybrid journals included in transformative agreements?
Najko Jahn
The ongoing controversy surrounding transformative agreements, which aim to transition subscription-based journal publishing to full open access, highlights the need for large-scal…
Reference Coverage Analysis of OpenAlex compared to Web of Science and Scopus
Jack Culbert, Anne Hobert, Najko Jahn +4
OpenAlex is a promising open source of scholarly metadata, and competitor to established proprietary sources, such as the Web of Science and Scopus. As OpenAlex provides its data f…
Understanding differences of the OA uptake within the German university landscape (2010-2020). Part 1: journal-based OA
Niels Taubert, Anne Hobert, Najko Jahn +2
This study investigates the determinants for the uptake of Full and Hybrid Open Access (OA) in the university landscape of Germany. It adapts the governance equaliser as a heuristi…
No Deal: Investigating the Influence of Restricted Access to Elsevier Journals on German Researchers' Publishing and Citing Behaviours
Nicholas Fraser, Anne Hobert, Najko Jahn +2
In 2014, a union of German research organisations established Projekt DEAL, a national-level project to negotiate licensing agreements with large scientific publishers. Negotiation…
Transparency to hybrid open access through publisher-provided metadata: An article-level study of Elsevier
Najko Jahn, Lisa Matthias, Mikael Laakso
With the growth of open access (OA), the financial flows in scholarly journal publishing have become increasingly complex, but comprehensive data and transparency into these flows…
Comment on "Open is not forever: a study of vanished open access journals"
Matan Shelomi
We comment on a recent article by Laakso et al. (arXiv:2008.11933 [cs.DL]), in which the disappearance of 176 open access journals from the Internet is noted. We argue that one rea…
Open is not forever: a study of vanished open access journals
Mikael Laakso, Lisa Matthias, Najko Jahn
The preservation of the scholarly record has been a point of concern since the beginning of knowledge production. With print publications, the responsibility rested primarily with…
T-Duality in Superspace
M. Abou-Zeid, C. M. Hull, U. Lindström +1
We find the T-duality transformation rules for 2-dimensional (2,1) supersymmetric sigma-models in (2,1) superspace. Our results clarify certain aspects of the (2,1) sigma model geo…
A low-luminosity type-1 QSO sample. V. Overluminous host spheroids and their excitation mechanisms
Gerold Busch, Nastaran Fazeli, Andreas Eckart +6
We present near-infrared (NIR) -band longslit spectra of eleven galaxies which are obtained with SOFI at the NTT (ESO). The galaxies are chosen from the low-luminosity type-1…
SUBARU and e-Merlin observations of NGC3718. Diaries of an SMBH recoil?
K. Markakis, J. Dierkes, A. Eckart +6
NGC3718 is a LINER galaxy, lying at a distance of about Mpc away from earth and its similarities with NGC5128 often award it the name "northern Centaurus A". We…