This map shows the geographic impact of W.P. Spaan'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.P. Spaan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites W.P. Spaan more than expected).
This network shows the impact of papers produced by W.P. Spaan. 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.P. Spaan. The network helps show where W.P. Spaan may publish in the future.
Co-authorship network of co-authors of W.P. Spaan
This figure shows the co-authorship network connecting the top 25 collaborators of W.P. Spaan.
A scholar is included among the top collaborators of W.P. Spaan 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.P. Spaan. W.P. Spaan is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Lojka, Bohdan, W.P. Spaan, W.B. Hoogmoed, & Héléna Posthumus. (2006). Prediction of soil loss and crop yields with different management scenarios in barrier system using the SCUAF model in semi-arid Burkina Faso. Socio-Environmental Systems Modeling. 39(3). 158–164.2 indexed citations
Spaan, W.P., et al.. (2004). Implementation of contour vegetation barriers under farmer conditions in Burkina Faso and Mali. Socio-Environmental Systems Modeling. 43(1). 21–38.19 indexed citations
Riksen, Michel, et al.. (2004). Windbreaks: evaluation and planning. Socio-Environmental Systems Modeling. 151–168.1 indexed citations
10.
Posthumus, Héléna & W.P. Spaan. (2001). Rainfall-runoff relations for vegetation barriers in the Sahel.. Socio-Environmental Systems Modeling. 50–53.3 indexed citations
Graaff, J. de & W.P. Spaan. (2000). The costs of soil and water conservation measures in the Sahel. Socio-Environmental Systems Modeling. 833–844.2 indexed citations
13.
Spaan, W.P., et al.. (1999). Estimation of water use of vegetation barriers based on climatological factors and soil moisture levels. Socio-Environmental Systems Modeling.1 indexed citations
14.
Spaan, W.P., et al.. (1998). Evaluation of the effectiveness of soil and water conservation measures in a closed sylvo-pastoral area in Burkina Faso.. Socio-Environmental Systems Modeling. 31. 1295–1301.1 indexed citations
Spaan, W.P., et al.. (1995). Choix et modalités d'exécution des mesures de conservation des eaux et des sols au Sahel.. Socio-Environmental Systems Modeling.9 indexed citations
17.
Spaan, W.P. & C.J. Stigter. (1991). A review of some simple wind erosion measuring methods and devices.. Postgraduate Medicine. 92(2). 47–47.1 indexed citations
Spaan, W.P., et al.. (1990). Wind erosion measurements on Schiermonnikoog. Report II. Report of the Workshop held from 20 to 23 May 1990.. Socio-Environmental Systems Modeling.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.