Karl Hammer

4.6k total citations
175 papers, 3.2k citations indexed

About

Karl Hammer is a scholar working on Plant Science, Ecology, Evolution, Behavior and Systematics and Molecular Biology. According to data from OpenAlex, Karl Hammer has authored 175 papers receiving a total of 3.2k indexed citations (citations by other indexed papers that have themselves been cited), including 128 papers in Plant Science, 57 papers in Ecology, Evolution, Behavior and Systematics and 43 papers in Molecular Biology. Recurrent topics in Karl Hammer's work include Botanical Research and Chemistry (24 papers), Botany and Plant Ecology Studies (23 papers) and Yeasts and Rust Fungi Studies (20 papers). Karl Hammer is often cited by papers focused on Botanical Research and Chemistry (24 papers), Botany and Plant Ecology Studies (23 papers) and Yeasts and Rust Fungi Studies (20 papers). Karl Hammer collaborates with scholars based in Germany, Italy and Cuba. Karl Hammer's co-authors include P. Perrino, Korous Khoshbakht, Gaetano Laghetti, Peter Hanelt, H. Knüpffer, Christian Lehmann, Andreas Buerkert, Klaus Pistrick, Jens Gebauer and Domenico Pignone and has published in prestigious journals such as SHILAP Revista de lepidopterología, BioScience and The American Historical Review.

In The Last Decade

Karl Hammer

162 papers receiving 2.8k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Karl Hammer Germany 30 2.5k 687 634 633 504 175 3.2k
B. V. Ford‐Lloyd United Kingdom 34 3.1k 1.3× 696 1.0× 1.1k 1.7× 1.1k 1.8× 372 0.7× 118 3.9k
T. Hodgkin Italy 25 2.9k 1.1× 724 1.1× 725 1.1× 862 1.4× 451 0.9× 80 4.2k
A. Charrier France 32 2.2k 0.9× 308 0.4× 763 1.2× 556 0.9× 279 0.6× 92 3.4k
Nigel Maxted United Kingdom 33 3.4k 1.3× 1.1k 1.5× 607 1.0× 1.0k 1.6× 496 1.0× 154 4.3k
Hannes Dempewolf United States 21 1.9k 0.8× 475 0.7× 549 0.9× 606 1.0× 412 0.8× 37 2.9k
J. G. Hawkes United Kingdom 29 2.6k 1.0× 723 1.1× 738 1.2× 435 0.7× 976 1.9× 92 3.3k
N. W. Simmonds United Kingdom 33 4.0k 1.6× 556 0.8× 935 1.5× 611 1.0× 777 1.5× 126 5.1k
Charles B. Heiser United States 28 2.3k 0.9× 1.4k 2.0× 894 1.4× 601 0.9× 484 1.0× 99 3.5k
Rubens Onofre Nodari Brazil 31 2.6k 1.0× 743 1.1× 1.1k 1.8× 473 0.7× 248 0.5× 200 3.7k
Allison J. Miller United States 29 1.8k 0.7× 553 0.8× 888 1.4× 424 0.7× 374 0.7× 82 2.9k

Countries citing papers authored by Karl Hammer

Since Specialization
Citations

This map shows the geographic impact of Karl Hammer'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 Karl Hammer with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Karl Hammer more than expected).

Fields of papers citing papers by Karl Hammer

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Karl Hammer. 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 Karl Hammer. The network helps show where Karl Hammer may publish in the future.

Co-authorship network of co-authors of Karl Hammer

This figure shows the co-authorship network connecting the top 25 collaborators of Karl Hammer. A scholar is included among the top collaborators of Karl Hammer 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 Karl Hammer. Karl Hammer 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.
Бадаева, Е. Д., Fedor A. Konovalov, H. Knüpffer, et al.. (2021). Genetic diversity, distribution and domestication history of the neglected GGAtAt genepool of wheat. Theoretical and Applied Genetics. 135(3). 755–776. 21 indexed citations
2.
Бадаева, Е. Д., Fedor A. Konovalov, H. Knüpffer, et al.. (2021). Correction to: Genetic diversity, distribution and domestication history of the neglected GGAtAt genepool of wheat. Theoretical and Applied Genetics. 134(10). 3493–3493. 3 indexed citations
3.
Laghetti, Gaetano, et al.. (2012). Collecting crop genetic resources in two Italian linguistic (Occitan and Ladin) islands and West Liguria with historical and ethnobotanical notes. International Journal of Biodiversity and Conservation. 4(2). 54–70. 5 indexed citations
4.
Laghetti, Gaetano, et al.. (2012). Survey for The Conservation of Agrobiodiversity in Three Italian Linguistic (Occitan, Croatian and Franco-Provençal) Islands.. Journal of Biology and Life Science. 4(1). 5 indexed citations
5.
Hammer, Karl. (2010). Der Reformator Oekolampad (1482-1531). Zwingliana. 157–170.
6.
Filatenko, A. A., et al.. (2010). Six new botanical varieties of Triticum from Oman. Genetic Resources and Crop Evolution. 57(8). 1135–1139. 6 indexed citations
7.
Khoshbakht, Korous & Karl Hammer. (2008). Species Richness in Relation to the Presence of Crop Plants in Families of Higher Plants. SHILAP Revista de lepidopterología. 9 indexed citations
8.
Hammer, Karl, et al.. (2008). Plant Genetic Resources: Selected Issues from Genetic Erosion to Genetic Engineering. SHILAP Revista de lepidopterología. 62 indexed citations
9.
Pignone, Domenico, Incoronata Galasso, Karl Hammer, & P. Perrino. (2008). Cytotaxonomy of Aegilops fragilis, a race from southern Italy. Hereditas. 116(1-2). 137–140.
10.
Khoshbakht, Korous & Karl Hammer. (2007). Threatened and Rare Ornamental Plants. SHILAP Revista de lepidopterología. 11 indexed citations
11.
Hammer, Karl, et al.. (2001). Monographs on underutilized and neglected crops. Genetic Resources and Crop Evolution. 48(1). 3–5. 45 indexed citations
12.
Hammer, Karl, et al.. (1993). 50 Jahre Genbank Gatersleben. Biologie in unserer Zeit. 23(6). 356–362. 2 indexed citations
13.
Hammer, Karl, et al.. (1990). Das GaterslebenerAntirrhinum-Sortiment@@@The GaterslebenAntirrhinum collection@@@Гатерслебенская коллекцияAntirrhinum. 38(2). 91–117. 12 indexed citations
14.
Hanelt, Peter & Karl Hammer. (1987). Einige infraspezifische Umkombinationen und Neubeschreibungen bei Kultursippen von Brassica L. und Papaver L. Feddes Repertorium. 98(11-12). 553–555. 5 indexed citations
15.
Fritsch, Reinhard, et al.. (1987). Taxonomy and evolution of cultivated plants: Literature review 1985/1986. Genetic Resources and Crop Evolution. 35(2). 421–439. 1 indexed citations
16.
Valkoun, J., et al.. (1985). Disease resistance in the genusAegilops L. — stem rust, leaf rust, stripe rust, and powdery mildew. Genetic Resources and Crop Evolution. 33(2). 133–153. 51 indexed citations
17.
Hammer, Karl. (1985). Bericht über eine Reise in die VR Polen zur Sammlung autochthoner Sippen von Kulturpflanzen im Jahre 1984. Genetic Resources and Crop Evolution. 33(2). 213–223. 1 indexed citations
18.
19.
Hammer, Karl. (1982). Weltmission und Kolonialismus. Sendungsideen des 19. Jahrhunderts im Konflikt. Verfassung in Recht und Übersee. 15(1). 87–88. 4 indexed citations
20.
Hammer, Karl & Reinhard Fritsch. (1977). Zur Frage nach der Ursprungsart des KulturmohnsPapaver somniferum L.. Genetic Resources and Crop Evolution. 25(1). 113–124. 21 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.

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Breakdown of academic impact, for papers by B. V. Ford‐Lloyd Breakdown of academic impact, for papers by T. Hodgkin Breakdown of academic impact, for papers by A. Charrier Breakdown of academic impact, for papers by Nigel Maxted Breakdown of academic impact, for papers by Hannes Dempewolf Breakdown of academic impact, for papers by J. G. Hawkes Breakdown of academic impact, for papers by N. W. Simmonds Breakdown of academic impact, for papers by Charles B. Heiser Breakdown of academic impact, for papers by Rubens Onofre Nodari Breakdown of academic impact, for papers by Allison J. Miller
Rankless by CCL
2026