Citations per year, relative to Hagen Keller Hagen Keller (= 1×)
peers
Leonard E. Boyle
Countries citing papers authored by Hagen Keller
Since
Specialization
Citations
This map shows the geographic impact of Hagen Keller'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 Hagen Keller with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hagen Keller more than expected).
This network shows the impact of papers produced by Hagen Keller. 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 Hagen Keller. The network helps show where Hagen Keller may publish in the future.
Co-authorship network of co-authors of Hagen Keller
This figure shows the co-authorship network connecting the top 25 collaborators of Hagen Keller.
A scholar is included among the top collaborators of Hagen Keller 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 Hagen Keller. Hagen Keller is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Keller, Hagen. (1998). Gli statuti dell'Italia settentrionale come testimonianza e fonte per il processo di affermazione della scrittura nei secoli XII e XIII.2 indexed citations
5.
Keller, Hagen, et al.. (1997). Vom Kloster zum Klosterverband : das Werkzeug der Schriftlichkeit : Akten des Internationalen Kolloquiums des Projekts L 2 im SFB 231 (22.-23. Februar 1996). Bayerische Staatsbibliothek.
6.
Keller, Hagen, et al.. (1996). Der Codex im Gebrauch. Fink eBooks.1 indexed citations
7.
Meier, Christel, et al.. (1996). Der Codex im Gebrauch : Akten des Internationalen Kolloquiums, 11.-13. Juni 1992. W. Fink eBooks.1 indexed citations
8.
Keller, Hagen, et al.. (1995). Kommunales Schriftgut in Oberitalien : Formen, Funktionen, Überlieferung. W. Fink eBooks.1 indexed citations
Keller, Hagen, et al.. (1992). Pragmatische Schriftlichkeit im Mittelalter : Erscheinungsformen und Entwicklungsstufen. W. Fink eBooks.13 indexed citations
11.
Keller, Hagen. (1989). Gli inizi del comune in Lombardia: Limiti della documentazione e metodi di ricerca.
12.
Keller, Hagen. (1986). Zwischen regionaler Begrenzung und universalem Horizont : Deutschland im Imperium der Salier und Staufer, 1024 bis 1250.4 indexed citations
13.
Althoff, Gerd & Hagen Keller. (1985). Heinrich I. und Otto der Grosse : Neubeginn auf karolingischem Erbe.1 indexed citations
Keller, Hagen. (1971). Vescovi, conti e sovrani nella crisi del Regno Italico: Ricerche sull'aristocrazia carolingia in Italia III. Quellen und Forschungen aus italienischen Archiven und Bibliotheken.3 indexed citations
17.
Keller, Hagen. (1971). Geschichte der Franken bis zur Mitte des 6. Jahrhunderts. Quellen und Forschungen aus italienischen Archiven und Bibliotheken.3 indexed citations
Keller, Hagen. (1965). Consors regni: Un problema carolingio. Quellen und Forschungen aus italienischen Archiven und Bibliotheken.2 indexed citations
20.
Keller, Hagen. (1964). La Bibbia nell'alto medioevo. Quellen und Forschungen aus italienischen Archiven und Bibliotheken.2 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.