This map shows the geographic impact of A. Witzel'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 A. Witzel with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites A. Witzel more than expected).
This network shows the impact of papers produced by A. Witzel. 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 A. Witzel. The network helps show where A. Witzel may publish in the future.
Co-authorship network of co-authors of A. Witzel
This figure shows the co-authorship network connecting the top 25 collaborators of A. Witzel.
A scholar is included among the top collaborators of A. Witzel 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 A. Witzel. A. Witzel 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.
Britzen, S., S. J. Qian, W. Steffen, et al.. (2017). A swirling jet in the quasar 1308+326. Astronomy and Astrophysics. 602. A29–A29.21 indexed citations
Kraus, Adam L., A. Quirrenbach, M. Risse, et al.. (1999). UNUSUAL RADIO VARIABILITY IN THE BL LACERTAE OBJECT 0235+164. ASPC. 344(3). 67–816.1 indexed citations
10.
Zhang, Xizhen, et al.. (1998). Correlation between TeV γ-ray flare and hard X-ray burst in Mrk 421.. 18. 17–22.
11.
Guirado, J. C., J. M. Marcaide, P. Elósegui, et al.. (1995). VLBI differential astrometry of the radio sources 1928+738 and 2007+777 at 5 GHz.. A&A. 293. 613–625.
12.
Biermann, Peter L., et al.. (1992). X-ray observations of flat spectrum radio sources with the HEAO-A, Einstein and EXOSAT observatories. Astronomy & Astrophysics Supplement Series. 96(2). 339–349.1 indexed citations
13.
Witzel, A., T. P. Krichbaum, A. Quirrenbach, & C. A. Hummel. (1991). On the trajectories of the superluminal knots in the quasar 3C 345.. 32. 369–379.1 indexed citations
14.
Quirrenbach, A., et al.. (1990). Simultaneous optical and radio monitoring of rapid variability in quasars and BL Lac objects.. 235(16). 1105–15.5 indexed citations
15.
Eckart, A., A. Witzel, Peter L. Biermann, et al.. (1987). Investigation of a complete sample of flat spectrum radio sources from the S5 survey. II. Results.. Astronomy & Astrophysics Supplement Series. 67(1). 121–146.2 indexed citations
16.
Witzel, A., et al.. (1986). Kurzzeit-Variabilität extragalaktischer Radioquellen. 65. 239.13 indexed citations
17.
Kollatschny, W., et al.. (1983). Nuclear activity in the barred spiral galaxy NGC 3660 from radio, optical and X-ray observations.. A&A. 119. 80–84.
18.
Kuehr, H., et al.. (1981). A catalogue of extragalactic radio sources having flux densities greater than 1 Jy at 5 GHz.. Astronomy & Astrophysics Supplement Series. 45. 367–430.33 indexed citations
19.
Pauliny‐Toth, I. I. K., et al.. (1980). A deep survey of selected regions for extragalactic sources at 4.85 GHz.. A&A. 85. 329–331.2 indexed citations
20.
Kellermann, K. I., I. I. K. Pauliny‐Toth, В. И. Костенко, et al.. (1980). The Structure of the Nucleus of the Seyfert Galaxy NGC1275. 6. 42–47.1 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.