This map shows the geographic impact of Roger Collins'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 Roger Collins with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Roger Collins more than expected).
This network shows the impact of papers produced by Roger Collins. 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 Roger Collins. The network helps show where Roger Collins may publish in the future.
Co-authorship network of co-authors of Roger Collins
This figure shows the co-authorship network connecting the top 25 collaborators of Roger Collins.
A scholar is included among the top collaborators of Roger Collins 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 Roger Collins. Roger Collins is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Collins, Roger. (2007). Die Fredegar-Chroniken.8 indexed citations
3.
Collins, Roger. (2006). The Story of Wamba: Julian of Toledo's 'Historia Wambae Regis.'. The Catholic historical review. 92(3). 299.1 indexed citations
4.
Collins, Roger, et al.. (2002). Medieval Spain : culture, conflict, and coexistence : studies in honour of Angus MacKay. Palgrave Macmillan eBooks.3 indexed citations
5.
Collins, Roger, et al.. (2002). Medieval Spain. Palgrave Macmillan UK eBooks.3 indexed citations
6.
Collins, Sam G. & Roger Collins. (2002). Early Medieval Europe 300-1000. The History Teacher. 35(2). 267–267.1 indexed citations
7.
Collins, Roger, et al.. (2001). Victoris Tunnunensis Chronicon cum reliquiis ex Consularibus Caesaraugustanis et Iohannis Biclarensis Chronicon.10 indexed citations
8.
Collins, Roger. (2000). Visigothic Spain 409–711. The Journal of the Abraham Lincoln Association. 39–62.28 indexed citations
9.
Collins, Roger. (1998). Spain: An Oxford Archaeological Guide. Medical Entomology and Zoology.1 indexed citations
Collins, Roger, et al.. (1994). The Ecclesiastical history of the English people ; The Greater chronicle ; Bede's letter to Egbert. Oxford University Press eBooks.4 indexed citations
Wormald, Patrick, Donald A. Bullough, & Roger Collins. (1983). Ideal and reality in Frankish and Anglo-Saxon society : studies presented to J.M. Wallace-Hadrill.35 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.