Hans‐Olaf Johannessen

31 papers and 634 indexed citations
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About

Hans‐Olaf Johannessen is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Radiology, Nuclear Medicine and Imaging. According to data from OpenAlex, Hans‐Olaf Johannessen has authored 31 papers receiving a total of 634 indexed citations (citations by other indexed papers that have themselves been cited), including 22 papers in Surgery, 16 papers in Pulmonary and Respiratory Medicine and 6 papers in Radiology, Nuclear Medicine and Imaging. Recurrent topics in Hans‐Olaf Johannessen’s work include Esophageal and GI Pathology (13 papers), Esophageal Cancer Research and Treatment (8 papers) and Gastric Cancer Management and Outcomes (7 papers). Hans‐Olaf Johannessen is often cited by papers focused on Esophageal and GI Pathology (13 papers), Esophageal Cancer Research and Treatment (8 papers) and Gastric Cancer Management and Outcomes (7 papers). Hans‐Olaf Johannessen collaborates with scholars based in Norway, Sweden and Germany. Hans‐Olaf Johannessen's co-authors include Marit Slaaen, Siri Rostoft, Arne Bakka, Torgeir Bruun Wyller, Arild Nesbakken, Eva Skovlund, Egil Johnson, Riccardo A. Audisio, Erik Carlsen and Erlend Christoffer Sommer Landsend and has published in prestigious journals such as Annals of Surgery, International Journal of Radiation Oncology*Biology*Physics and Critical Reviews in Oncology/Hematology.

In The Last Decade

Co-authorship network of co-authors of Hans‐Olaf Johannessen

This figure shows the co-authorship network connecting the top 25 collaborators of Hans‐Olaf Johannessen. A scholar is included among the top collaborators of Hans‐Olaf Johannessen 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 Hans‐Olaf Johannessen. Hans‐Olaf Johannessen is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

Hans‐Olaf Johannessen

31 papers receiving 592 citations

Fields of papers citing papers by Hans‐Olaf Johannessen

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hans‐Olaf Johannessen. 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 Hans‐Olaf Johannessen. The network helps show where Hans‐Olaf Johannessen may publish in the future.

Countries citing papers authored by Hans‐Olaf Johannessen

Since Specialization
Citations

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

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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