Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies
if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the
same subfield and year (this is the minimum needed to enter the top 1%, not the average
within it), or reaches the top citation threshold in at least one of its specific research
topics.
This map shows the geographic impact of W.G. Sombroek'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 W.G. Sombroek with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites W.G. Sombroek more than expected).
This network shows the impact of papers produced by W.G. Sombroek. 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 W.G. Sombroek. The network helps show where W.G. Sombroek may publish in the future.
Co-authorship network of co-authors of W.G. Sombroek
This figure shows the co-authorship network connecting the top 25 collaborators of W.G. Sombroek.
A scholar is included among the top collaborators of W.G. Sombroek 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 W.G. Sombroek. W.G. Sombroek 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.
Sombroek, W.G., Dirse Clara Kern, M. da S. Cravo, et al.. (2002). Terra preta and terra mulata: pre-columbian Amazon Kitchen middens and agricultural fields, their sustainability and their replication.. Portuguese National Funding Agency for Science, Research and Technology (RCAAP Project by FCT).29 indexed citations
Sombroek, W.G., et al.. (1993). Amounts, dynamics and sequestering of carbon in tropical and subtropical soils. AMBIO. 22(7). 417–426.301 indexed citations
9.
Sombroek, W.G., et al.. (1993). Land degradation in arid, semi-arid and dry sub-humid areas: rainfed and irrigated lands, rangelands and woodlands.10 indexed citations
10.
Sombroek, W.G.. (1992). Biomass and carbon storage in the amazon ecosystems. Interciencia. 17(5). 269–272.11 indexed citations
11.
Ayoub, Ali, L.R. Oldeman, R.T.A. Hakkeling, & W.G. Sombroek. (1991). World map of the status of human-induced soil degradation :.211 indexed citations
Sombroek, W.G.. (1980). Soils of the Amazon region and their ecological stability.. 14–27.1 indexed citations
17.
Sombroek, W.G., et al.. (1976). Soils of semi-arid savanna zone of the north-eastern Kenya : site evaluation report. University of Nairobi Research Archive (University of Nairobi).2 indexed citations
18.
Sombroek, W.G., et al.. (1973). Report on a site evaluation of the irrigation suitability of the soils and waters of the Merti area (Isiolo district). Socio-Environmental Systems Modeling.1 indexed citations
19.
Sombroek, W.G. & I. S. Zonneveld. (1971). Ancient dune fields and fluviatile deposits in the Rima-Sokoto river basin (N.W.Nigeria) : geomorphologic phenomena in relation to Quaternary changes in climate at the southern edge of the Sahara. Data Archiving and Networked Services (DANS).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.