List of publications by Ludo Waltman
If you would like to have a copy of one of my publications, please send me an e-mail.
Submitted papers
- L. Waltman, N.J. van Eck, R. Dekker, and U. Kaymak. An evolutionary model of price competition among spatially distributed firms. The software is available here.
Journal papers
- L. Waltman and N.J. van Eck. A mathematical analysis of the long-run behavior of genetic algorithms for social modeling. Soft Computing, in press. The software is available here.
- L. Waltman and N.J. van Eck. The inconsistency of the h-index. Journal of the American Society for Information Science and Technology, in press. arXiv:1108.3901.
- L. Waltman, N.J. van Eck, and A.F.J. van Raan. Universality of citation distributions revisited. Journal of the American Society for Information Science and Technology, 63(1):72-77, 2012. arXiv:1105.2934.
- L. Waltman, N.J. van Eck, R. Dekker, and U. Kaymak. Economic modeling using evolutionary algorithms: The effect of a binary encoding of strategies. Journal of Evolutionary Economics, 21(5):737-756, 2011. The software is available here.
- L. Waltman, R.J.W. Tijssen, and N.J. van Eck. Globalisation of science in kilometres. Journal of Informetrics, 5(4):574-582, 2011. arXiv:1103.3648.
- L. Bornmann and L. Waltman. The detection of "hot regions" in the geography of science: A visualization approach by using density maps. Journal of Informetrics, 5(4):547-553, 2011. arXiv:1102.3862. Some supplementary material is available here.
- L. Waltman, E. Yan, and N.J. van Eck. A recursive field-normalized bibliometric performance indicator: An application to the field of library and information science. Scientometrics, 89(1):301-314, 2011. arXiv:1105.3212.
- L. Waltman, N.J. van Eck, T.N. van Leeuwen, M.S. Visser, and A.F.J. van Raan. On the correlation between bibliometric indicators and peer review: Reply to Opthof and Leydesdorff. Scientometrics, 88(3):1017-1022, 2011. arXiv:1105.5316. The data is available here.
- R.J.W. Tijssen, L. Waltman, and N.J. van Eck. Collaborations span 1,553 kilometres. Nature, 473(7346):154, 2011. Correspondence.
- L. Waltman, N.J. van Eck, T.N. van Leeuwen, M.S. Visser, and A.F.J. van Raan. Towards a new crown indicator: An empirical analysis. Scientometrics, 87(3):467-481, 2011. arXiv:1004.1632.
- L. Egghe and L. Waltman. Relations between the shape of a size-frequency distribution and the shape of a rank-frequency distribution. Information Processing and Management, 47(2):238-245, 2011.
- L. Waltman, N.J. van Eck, T.N. van Leeuwen, M.S. Visser, and A.F.J. van Raan. Towards a new crown indicator: Some theoretical considerations. Journal of Informetrics, 5(1):37-47, 2011. arXiv:1003.2167.
- N.J. van Eck, L. Waltman, R. Dekker, and J. van den Berg. A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS. Journal of the American Society for Information Science and Technology, 61(12):2405-2416, 2010. arXiv:1003.2551. The bibliometric maps are available here.
- L. Waltman, N.J. van Eck, and E.C.M. Noyons. A unified approach to mapping and clustering of bibliometric networks. Journal of Informetrics, 4(4):629-635, 2010. arXiv:1006.1032. Some supplementary material is available here.
- L. Waltman and N.J. van Eck. The relation between Eigenfactor, audience factor, and influence weight. Journal of the American Society for Information Science and Technology, 61(7):1476-1486, 2010. arXiv:1003.2198.
- N.J. van Eck and L. Waltman. Software survey: VOSviewer, a computer program for bibliometric mapping. Scientometrics, 84(2):523-538, 2010. VOSviewer is available here. The journal co-citation map is available here.
- A.F.J. van Raan, T.N. van Leeuwen, M.S. Visser, N.J. van Eck, and L. Waltman. Rivals for the crown: Reply to Opthof and Leydesdorff. Journal of Informetrics, 4(3):431-435, 2010. arXiv:1003.2113.
- N.J. van Eck, L. Waltman, E.C.M. Noyons, and R.K. Buter. Automatic term identification for bibliometric mapping. Scientometrics, 82(3):581-596, 2010. The term map is available here.
- N.J. van Eck and L. Waltman. On the proper understanding of the limiting behavior of generalizations of the h- and g-indices. Journal of Informetrics, 3(4):369-370, 2009. Letter to the editor.
- L. Waltman and N.J. van Eck. Some comments on Egghe's derivation of the impact factor distribution. Journal of Informetrics, 3(4):363-366, 2009.
- N.J. van Eck and L. Waltman. How to normalize cooccurrence data? An analysis of some well-known similarity measures. Journal of the American Society for Information Science and Technology, 60(8):1635-1651, 2009.
- L. Waltman and N.J. van Eck. Robust evolutionary algorithm design for socio-economic simulation: Some comments. Computational Economics, 33(1):103-105, 2009.
- L. Waltman and N.J. van Eck. Some comments on the journal weighted impact factor proposed by Habibzadeh and Yadollahie. Journal of Informetrics, 2(4):369-372, 2008.
- N.J. van Eck and L. Waltman. Generalizing the h- and g-indices. Journal of Informetrics, 2(4):263-271, 2008.
- L. Waltman and U. Kaymak. Q-learning agents in a Cournot oligopoly model. Journal of Economic Dynamics and Control, 32(10):3275-3293, 2008. The source code of the simulations is available here.
- N.J. van Eck and L. Waltman. Appropriate similarity measures for author cocitation analysis. Journal of the American Society for Information Science and Technology, 59(10):1653-1661, 2008.
- N.J. van Eck and L. Waltman. Bibliometric mapping of the computational intelligence field. International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems, 15(5):625-645, 2007. The concept (density) maps and the concept map viewer are available here.
- L. Waltman and N.J. van Eck. Some comments on the question whether co-occurrence data should be normalized. Journal of the American Society for Information Science and Technology, 58(11):1701-1703, 2007.
- N.J. van Eck, L. Waltman, J. van den Berg, and U. Kaymak. Visualizing the computational intelligence field. IEEE Computational Intelligence Magazine, 1(4):6-10, 2006. The concept map viewer is available here.
Conference papers
- N.J. van Eck and L. Waltman. VOSviewer: A computer program for bibliometric mapping. In B. Larsen and J. Leta, editors, Proceedings of the 12th International Conference on Scientometrics and Informetrics, pages 886-897, 2009. VOSviewer is available here.
- L. Waltman and U. Kaymak. A theoretical analysis of cooperative behavior in multi-agent Q-learning. In Proceedings of the 2007 IEEE Symposium on Approximate Dynamic Programming and Reinforcement Learning, pages 84-91, 2007.
- N.J. van Eck and L. Waltman. VOS: a new method for visualizing similarities between objects. In H.-J. Lenz and R. Decker, editors, Advances in Data Analysis: Proceedings of the 30th Annual Conference of the German Classification Society, Studies in Classification, Data Analysis, and Knowledge Organization, pages 299-306. Springer, 2007.
- N.J. van Eck, L. Waltman, J. van den Berg, and U. Kaymak. Visualizing the WCCI 2006 knowledge domain. In Proceedings of the 2006 IEEE International Conference on Fuzzy Systems, pages 7862-7869, 2006. The concept map viewer is available here.
- L. Waltman, U. Kaymak, and J. van den Berg. Fuzzy histograms: a statistical analysis. In Proceedings of the 4th Conference of the European Society for Fuzzy Logic and Technology, pages 605-610, 2005.
- N.J. van Eck, L. Waltman, and J. van den Berg. A novel algorithm for visualizing concept associations. In Proceedings of the 16th International Workshop on Database and Expert Systems Applications, pages 405-409, 2005. The viewer software is available here.
- L. Waltman, U. Kaymak, and J. van den Berg. Maximum likelihood parameter estimation in probabilistic fuzzy classifiers. In Proceedings of the 2005 IEEE International Conference on Fuzzy Systems, pages 1098-1103, 2005.
- L. Waltman and U. Kaymak. Reinforcement learning in repeated Cournot oligopoly games. In Proceedings of the European Symposium on Intelligent Technologies, Hybrid Systems and Their Implementation on Smart Adaptive Systems 2004, pages 209-217, 2004.
- J. van den Berg, N.J. van Eck, L. Waltman, and U. Kaymak. A VICORE architecture for intelligent knowledge management. In Proceedings of the KDNet Symposium on Knowledge-Based Services for the Public Sector, pages 63-74, 2004.
Technical reports
- L. Waltman and N.J. van Eck. A simple alternative to the h-index. Technical Report ERS-2009-043-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2009.
- L. Waltman, N.J. van Eck, R. Dekker, and U. Kaymak. Economic modeling using evolutionary algorithms: The effect of a binary encoding of strategies. Technical Report ERS-2009-028-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2009. The software is available here.
- L. Waltman and N.J. van Eck. Some comments on Egghe's derivation of the impact factor distribution. Technical Report ERS-2009-016-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2009.
- L. Waltman and N.J. van Eck. A taxonomy of bibliometric performance indicators based on the property of consistency. Technical Report ERS-2009-014-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2009.
- L. Waltman and N.J. van Eck. A mathematical analysis of the long-run behavior of genetic algorithms for social modeling. Technical Report ERS-2009-011-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2009. The software is available here.
- N.J. van Eck and L. Waltman. VOSviewer: A computer program for bibliometric mapping. Technical Report ERS-2009-005-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2009. VOSviewer is available here.
- N.J. van Eck and L. Waltman. How to normalize co-occurrence data? An analysis of some well-known similarity measures. Technical Report ERS-2009-001-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2009.
- N.J. van Eck, L. Waltman, E.C.M. Noyons, and R.K. Buter. Automatic term identification for bibliometric mapping. Technical Report ERS-2008-081-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2008. The term map is available here.
- N.J. van Eck and L. Waltman. Generalizing the h- and g-indices. Technical Report ERS-2008-049-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2008.
- N.J. van Eck and L. Waltman. Appropriate similarity measures for author cocitation analysis. Technical Report ERS-2007-091-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2007.
- N.J. van Eck and L. Waltman. Bibliometric mapping of the computational intelligence field. Technical Report ERS-2007-027-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2007. The concept (density) maps and the concept map viewer are available here.
- L. Waltman and N.J. van Eck. Some comments on the question whether co-occurrence data should be normalized. Technical Report ERS-2007-017-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2007.
- N.J. van Eck and L. Waltman. VOS: a new method for visualizing similarities between objects. Technical Report ERS-2006-020-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2006.
- L. Waltman and U. Kaymak. A theoretical analysis of cooperative behavior in multi-agent Q-learning. Technical Report ERS-2006-006-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2006.
- E. van Asperen, R. Dekker, M. Polman, H. de Swaan Arons, and L. Waltman. Arrival processes for vessels in a port simulation. Technical Report ERS-2003-067-LIS, Erasmus University Rotterdam, Erasmus Research Institute of Management, 2003.
Other publications