This map shows the geographic impact of J Purrmann'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 J Purrmann with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites J Purrmann more than expected).
This network shows the impact of papers produced by J Purrmann. 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 J Purrmann. The network helps show where J Purrmann may publish in the future.
Co-authorship network of co-authors of J Purrmann
This figure shows the co-authorship network connecting the top 25 collaborators of J Purrmann.
A scholar is included among the top collaborators of J Purrmann 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 J Purrmann. J Purrmann is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Purrmann, J, Ulrich Mödder, S. Cleveland, et al.. (1993). Association of primary sclerosing cholangitis with inflammatory bowel diseases: a prospective study.. PubMed. 31 Suppl 5. 56–9.3 indexed citations
Purrmann, J, et al.. (1992). Zinc in lymphocytes--the assessment of zinc status in patients with Crohn's disease.. PubMed. 6(2). 117–21.2 indexed citations
Betz, P., Christoph Elsing, J Purrmann, & H Frenzel. (1990). [Leishmaniasis of the upper gastrointestinal tract in an HIV positive patient].. PubMed. 11(2). 97–100.11 indexed citations
Piontek, Katharina, et al.. (1989). [Late initial manifestations of Crohn disease with atypical symptoms].. PubMed. 27(7). 383–7.2 indexed citations
11.
Purrmann, J, et al.. (1989). Investigation of genetic markers in patients with Crohn's disease and ulcerative colitis.. PubMed. 27(7). 366–9.3 indexed citations
12.
Purrmann, J, H Zeidler, J. Bertrams, et al.. (1988). HLA antigens in ankylosing spondylitis associated with Crohn's disease. Increased frequency of the HLA phenotype B27,B44.. PubMed. 15(11). 1658–61.49 indexed citations
13.
Purrmann, J, et al.. (1988). Association of Crohn's disease with HLA phenotype B44, Cw5.. PubMed. 26(10). 658–62.6 indexed citations
14.
Purrmann, J, et al.. (1987). [Therapeutic management and genetic counseling of pregnant patients with chronic inflammatory intestinal diseases].. PubMed. 28(12). 770–6.2 indexed citations
15.
Purrmann, J, et al.. (1987). Crohn's disease in a married couple.. PubMed. 34(3). 132–3.4 indexed citations
16.
Purrmann, J, et al.. (1986). Clinical features of inflammatory joint and spine manifestations in Crohn's disease.. PubMed. 33(3). 123–7.22 indexed citations
17.
Wienbeck, M, et al.. (1986). [Ulcerative colitis and Crohn disease. Early diagnosis and therapy].. PubMed. 27(3). 166–71.1 indexed citations
Purrmann, J, et al.. (1986). [Etiology of chronic inflammatory bowel diseases].. PubMed. 24(7). 357–63.1 indexed citations
20.
Purrmann, J, et al.. (1985). [HLA haplotype study in familial Crohn disease].. PubMed. 23(8). 432–7.10 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.