Ludo Waltman

Orcid: 0000-0001-8249-1752

Affiliations:
  • Leiden University, Centre for Science and Technology Studies (CWTS), The Netherlands


According to our database1, Ludo Waltman authored at least 106 papers between 2005 and 2024.

Collaborative distances:
  • Dijkstra number2 of five.
  • Erdős number3 of four.

Timeline

Legend:

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Links

Online presence:

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Bibliography

2024
To preprint or not to preprint: A global researcher survey.
J. Assoc. Inf. Sci. Technol., June, 2024

Which topics are best represented by science maps? An analysis of clustering effectiveness for citation and text similarity networks.
CoRR, 2024

2023
How to improve scientific peer review: Four schools of thought.
Learn. Publ., July, 2023

Academic information retrieval using citation clusters: in-depth evaluation based on systematic reviews.
Scientometrics, May, 2023

Retraction of Predatory publishing in Scopus: evidence on cross-country differences lacks justification.
Scientometrics, February, 2023

A comparison of citation-based clustering and topic modeling for science mapping.
CoRR, 2023

2022
The challenges of scientometric studies of predatory publishing.
Quant. Sci. Stud., 2022

Funding COVID-19 research: Insights from an exploratory analysis using open data infrastructures.
Quant. Sci. Stud., 2022

Innovating peer review, reconfiguring scholarly communication: an analytical overview of ongoing peer review innovation activities.
J. Documentation, 2022

Causal foundations of bias, disparity and fairness.
CoRR, 2022

2021
Understanding gender differences in science requires a diversity of perspectives, including controversial ones.
Quant. Sci. Stud., 2021

Large-scale comparison of bibliographic data sources: Scopus, Web of Science, Dimensions, Crossref, and Microsoft Academic.
Quant. Sci. Stud., 2021

A multidimensional framework for characterizing the citation impact of scientific publications.
Quant. Sci. Stud., 2021

Algorithmic labeling in hierarchical classifications of publications: Evaluation of bibliographic fields and term weighting approaches.
J. Assoc. Inf. Sci. Technol., 2021

A large-scale bibliometric analysis of global climate change research between 2001 and 2018.
CoRR, 2021

Gender differences in scientific careers: A large-scale bibliometric analysis.
CoRR, 2021

2020
Opening science: The rebirth of a scholarly journal.
Quant. Sci. Stud., 2020

Special issue on bibliographic data sources.
Quant. Sci. Stud., 2020

A principled methodology for comparing relatedness measures for clustering publications.
Quant. Sci. Stud., 2020

Browsing Citation Clusters for Academic Literature Search: A Simulation Study with Systematic Reviews.
Proceedings of the 10th International Workshop on Bibliometric-enhanced Information Retrieval co-located with 42nd European Conference on Information Retrieval, 2020

2019
Large-scale comparison of bibliographic data sources: Web of Science, Scopus, Dimensions, and Crossref.
Proceedings of the 17th International Conference on Scientometrics and Informetrics, 2019

Persistence of journal hierarchy in open access publishing.
Proceedings of the 17th International Conference on Scientometrics and Informetrics, 2019

Intermediacy of publications.
Proceedings of the 17th International Conference on Scientometrics and Informetrics, 2019

Measuring disagreement in science.
Proceedings of the 17th International Conference on Scientometrics and Informetrics, 2019

Variations in citation practices across the scientific landscape: Analysis based on a large full-text corpus.
Proceedings of the 17th International Conference on Scientometrics and Informetrics, 2019

Quantifying the long-term influence of scientific publications.
Proceedings of the 17th International Conference on Scientometrics and Informetrics, 2019

A multidimensional perspective on the citation impact of scientific publications.
Proceedings of the 17th International Conference on Scientometrics and Informetrics, 2019

An Interactive Visual Tool for Scientific Literature Search: Proposal and Algorithmic Specification.
Proceedings of the 8th International Workshop on Bibliometric-enhanced Information Retrieval (BIR 2019) co-located with the 41st European Conference on Information Retrieval (ECIR 2019), 2019

Field Normalization of Scientometric Indicators.
Proceedings of the Springer Handbook of Science and Technology Indicators., 2019

2018
Characterizing in-text citations in scientific articles: A large-scale analysis.
J. Informetrics, 2018

Analyzing the activities of visitors of the Leiden Ranking website.
J. Data Inf. Sci., 2018

The Closer the Better: Similarity of Publication Pairs at Different Cocitation Levels.
J. Assoc. Inf. Sci. Technol., 2018

From Louvain to Leiden: guaranteeing well-connected communities.
CoRR, 2018

Systematic analysis of agreement between metrics and peer review in the UK REF.
CoRR, 2018

Exploration of Reproducibility Issues in Scientometric Research Part 2: Conceptual Reproducibility.
CoRR, 2018

Exploration of reproducibility issues in scientometric research Part 1: Direct reproducibility.
CoRR, 2018

Field normalization of scientometric indicators.
CoRR, 2018

2017
Citation-based clustering of publications using CitNetExplorer and VOSviewer.
Scientometrics, 2017

Topic identification challenge.
Scientometrics, 2017

Special section on performance-based research funding systems.
J. Informetrics, 2017

Use of the journal impact factor for assessing individual articles need not be wrong.
CoRR, 2017

The Closer the Better: Similarity of Publication Pairs at Different Co-Citation Levels.
CoRR, 2017

Using full-text data to create improved term maps.
Proceedings of the 16th International Conference on Scientometrics and Informetrics, 2017

Accuracy of citation data in Web of Science and Scopus.
Proceedings of the 16th International Conference on Scientometrics and Informetrics, 2017

Exploring the Similarity of Articles Co-cited at Different Levels.
Proceedings of the 16th International Conference on Scientometrics and Informetrics, 2017

Reference behavior in the full text of scientific articles: A large-scale analysis.
Proceedings of the 16th International Conference on Scientometrics and Informetrics, 2017

2016
Large-scale analysis of the accuracy of the journal classification systems of Web of Science and Scopus.
J. Informetrics, 2016

The elephant in the room: The problem of quantifying productivity in evaluative scientometrics.
J. Informetrics, 2016

Conceptual difficulties in the use of statistical inference in citation analysis.
J. Informetrics, 2016

Special section on statistical inference in citation analysis.
J. Informetrics, 2016

Special section on size-independent indicators in citation analysis.
J. Informetrics, 2016

A review of the literature on citation impact indicators.
J. Informetrics, 2016

Constructing bibliometric networks: A comparison between full and fractional counting.
J. Informetrics, 2016

2015
Field-normalized citation impact indicators and the choice of an appropriate counting method.
J. Informetrics, 2015

Message from the new Editor-in-Chief.
J. Informetrics, 2015

Predicting the long-term citation impact of recent publications.
J. Informetrics, 2015

Field-normalized citation impact indicators using algorithmically constructed classification systems of science.
J. Informetrics, 2015

Clustering scientific publications based on citation relations: A systematic comparison of different methods.
CoRR, 2015

2014
CitNetExplorer: A new software tool for analyzing and visualizing citation networks.
J. Informetrics, 2014

The correlation between citation-based and expert-based assessments of publication channels: SNIP and SJR vs. Norwegian quality assessments.
J. Informetrics, 2014

F1000 Recommendations as a Potential New Data Source for Research Evaluation: A Comparison With Citations.
J. Assoc. Inf. Sci. Technol., 2014

Exploring the relationship between the Engineering and Physical Sciences and the Health and Life Sciences by advanced bibliometric methods.
CoRR, 2014

Systematic Retrieval of Scientific Literature based on Citation Relations: Introducing the CitNetExplorer Tool.
Proceedings of the First Workshop on Bibliometric-enhanced Information Retrieval co-located with 36th European Conference on Information Retrieval (ECIR 2014), 2014

2013
Source normalized indicators of citation impact: an overview of different approaches and an empirical comparison.
Scientometrics, 2013

Counting publications and citations: Is more always better?
J. Informetrics, 2013

Some modifications to the SNIP journal impact indicator.
J. Informetrics, 2013

A systematic empirical comparison of different approaches for normalizing citation impact indicators.
J. Informetrics, 2013

On the calculation of percentile-based bibliometric indicators.
J. Assoc. Inf. Sci. Technol., 2013

F1000 recommendations as a new data source for research evaluation: A comparison with citations
CoRR, 2013

A smart local moving algorithm for large-scale modularity-based community detection.
CoRR, 2013

2012
A mathematical analysis of the long-run behavior of genetic algorithms for social modeling.
Soft Comput., 2012

An empirical analysis of the use of alphabetical authorship in scientific publishing.
J. Informetrics, 2012

Universality of citation distributions revisited.
J. Assoc. Inf. Sci. Technol., 2012

A new methodology for constructing a publication-level classification system of science.
J. Assoc. Inf. Sci. Technol., 2012

The inconsistency of the h-index.
J. Assoc. Inf. Sci. Technol., 2012

The Leiden ranking 2011/2012: Data collection, indicators, and interpretation.
J. Assoc. Inf. Sci. Technol., 2012

Citation analysis may severely underestimate the impact of clinical research as compared to basic research
CoRR, 2012

Research collaboration and the expanding science grid: Measuring globalization processes worldwide
CoRR, 2012

2011
A recursive field-normalized bibliometric performance indicator: an application to the field of library and information science.
Scientometrics, 2011

On the correlation between bibliometric indicators and peer review: reply to Opthof and Leydesdorff.
Scientometrics, 2011

Towards a new crown indicator: an empirical analysis.
Scientometrics, 2011

Globalisation of science in kilometres.
J. Informetrics, 2011

Towards a new crown indicator: Some theoretical considerations.
J. Informetrics, 2011

The detection of "hot regions" in the geography of science - A visualization approach by using density maps.
J. Informetrics, 2011

Relations between the shape of a size-frequency distribution and the shape of a rank-frequency distribution.
Inf. Process. Manag., 2011

Text mining and visualization using VOSviewer
CoRR, 2011

2010
Automatic term identification for bibliometric mapping.
Scientometrics, 2010

Software survey: VOSviewer, a computer program for bibliometric mapping.
Scientometrics, 2010

A unified approach to mapping and clustering of bibliometric networks.
J. Informetrics, 2010

Rivals for the crown: Reply to Opthof and Leydesdorff.
J. Informetrics, 2010

The relation between Eigenfactor, audience factor, and influence weight.
J. Assoc. Inf. Sci. Technol., 2010

A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS.
J. Assoc. Inf. Sci. Technol., 2010

2009
Some comments on Egghe's derivation of the impact factor distribution.
J. Informetrics, 2009

On the proper understanding of the limiting behavior of generalizations of the h- and g-indices.
J. Informetrics, 2009

How to normalize cooccurrence data? An analysis of some well-known similarity measures.
J. Assoc. Inf. Sci. Technol., 2009

2008
Some comments on the journal weighted impact factor proposed by Habibzadeh and Yadollahie.
J. Informetrics, 2008

Generalizing the h- and g-indices.
J. Informetrics, 2008

Appropriate similarity measures for author co-citation analysis.
J. Assoc. Inf. Sci. Technol., 2008

2007
Some comments on the question whether co-occurrence data should be normalized.
J. Assoc. Inf. Sci. Technol., 2007

Bibliometric Mapping of the Computational Intelligence Field.
Int. J. Uncertain. Fuzziness Knowl. Based Syst., 2007

2006
Visualizing the computational intelligence field [Application Notes].
IEEE Comput. Intell. Mag., 2006

VOS: A New Method for Visualizing Similarities Between Objects.
Proceedings of the Advances in Data Analysis, 2006

Visualizing the WCCI 2006 Knowledge Domain.
Proceedings of the IEEE International Conference on Fuzzy Systems, 2006

2005
Maximum likelihood parameter estimation in probabilistic fuzzy classifiers.
Proceedings of the IEEE International Conference on Fuzzy Systems, 2005

Fuzzy histograms: A Statistical Analysis.
Proceedings of the Joint 4th Conference of the European Society for Fuzzy Logic and Technology and the 11th Rencontres Francophones sur la Logique Floue et ses Applications, 2005

A Novel Algorithm for Visualizing Concept Associations.
Proceedings of the 16th International Workshop on Database and Expert Systems Applications (DEXA 2005), 2005


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