This map shows the geographic impact of Jan Telgen's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Jan Telgen with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Jan Telgen more than expected).
This network shows the impact of papers produced by Jan Telgen. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Jan Telgen. The network helps show where Jan Telgen may publish in the future.
Co-authorship network of co-authors of Jan Telgen
This figure shows the co-authorship network connecting the top 25 collaborators of Jan Telgen.
A scholar is included among the top collaborators of Jan Telgen based on the total number of
citations received by their joint publications. Widths of edges
represent the number of papers authors have co-authored together.
Node borders
signify the number of papers an author published with Jan Telgen. Jan Telgen is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
All Works
20 of 20 papers shown
1.
Telgen, Jan, et al.. (2017). PBC as a Solution for Public Procurement Problems: Some Ethiopian Evidence. Journals & Books Hosting (International Knowledge Sharing Platform). 9(34). 97–108.2 indexed citations
Lange, Sandra, Jan Telgen, & Fredo Schotanus. (2014). Systematic review of 15 years of scientific literature on public procurement. University of Twente Research Information. 407–418.3 indexed citations
5.
Telgen, Jan, et al.. (2012). Challenges facing public procurement. Virtual Community of Pathological Anatomy (University of Castilla La Mancha).61 indexed citations
Harland, Christine, Guy Callender, Louise Knight, et al.. (2006). Public Procurement as a Lever of Government Reform: International Research Evidence. University of Twente Research Information.3 indexed citations
9.
Thai, Khi V., et al.. (2005). Challenges in public procurement : an international perspective. University of Twente Research Information.36 indexed citations
10.
Schotanus, Fredo & Jan Telgen. (2005). Implications of a classification of forms of cooperative purchasing. University of Twente Research Information.4 indexed citations
11.
Knight, Louise, Nigel Caldwell, Christine Harland, & Jan Telgen. (2004). Government reform and public procurement executive report from the first International Research Study on Public Procurement. Aston Publications Explorer (Aston University).9 indexed citations
12.
Knight, Louise, Nigel Caldwell, Christine Harland, & Jan Telgen. (2003). Government reform and public procurement: academic report of the first workshop, April 10-12, 2003, Budapest Hungary. University of Twente Research Information.4 indexed citations
Telgen, Jan. (1997). Revolution through electronic purchasing. Data Archiving and Networked Services (DANS). 499–504.5 indexed citations
15.
Boer, Luitzen de & Jan Telgen. (1995). Developments in purchasing of non-production items. University of Twente Research Information.5 indexed citations
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive
bibliographic database. While OpenAlex provides broad and valuable coverage of the global
research landscape, it—like all bibliographic datasets—has inherent limitations. These include
incomplete records, variations in author disambiguation, differences in journal indexing, and
delays in data updates. As a result, some metrics and network relationships displayed in
Rankless may not fully capture the entirety of a scholar's output or impact.