This map shows the geographic impact of J. Siepak'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 J. Siepak with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites J. Siepak more than expected).
This network shows the impact of papers produced by J. Siepak. 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 J. Siepak. The network helps show where J. Siepak may publish in the future.
Co-authorship network of co-authors of J. Siepak
This figure shows the co-authorship network connecting the top 25 collaborators of J. Siepak.
A scholar is included among the top collaborators of J. Siepak 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 J. Siepak. J. Siepak is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Siepak, J., et al.. (2015). An examination of the level of phosphorus in the soil as an indicator of human activity in prehistory at archaeological site no. 15a in Biskupin. Ekologia i Technika.1 indexed citations
3.
Siepak, J., et al.. (2012). Petroleum-Contaminated Soil and Water Analysis and Biodegradation. Polish Journal of Environmental Studies. 21(5).2 indexed citations
4.
Zioła‐Frankowska, Anetta, Marcin Frankowski, Witold Szczuciński, & J. Siepak. (2009). Analysis of labile aluminium form in grain size fractions of tsunami deposits in Thailand.. Polish Journal of Environmental Studies. 18(1). 77–85.7 indexed citations
5.
Frankowski, Marcin, et al.. (2008). Kofeina w kawach i ekstraktach kofeinowych i odkofeinowanych dostepnych na polskim rynku. Bromatologia i Chemia Toksykologiczna. 41(1). 21–27.4 indexed citations
6.
Walna, Barbara, et al.. (2005). Research on aluminium speciation in poor forest soils using the sequential extraction method. Polish Journal of Environmental Studies. 14(2).13 indexed citations
7.
Siepak, J. & Leonard Boszke. (2004). Analytical methods in determination of mercury species in environmental samples. An overview. 12(2).2 indexed citations
8.
Boszke, Leonard, et al.. (2004). Distribution of Mercury and Other Heavy Metals in Bottom Sediments of the Middle Odra River (Germany/Poland). Polish Journal of Environmental Studies. 13(5).58 indexed citations
9.
Boszke, Leonard, et al.. (2003). Environmental factors affecting speciation of mercury in the bottom sediments; an overview. Polish Journal of Environmental Studies. 12(1).68 indexed citations
10.
Niedzielski, Przemysław, et al.. (2002). Atomic Absorption Spectrometry in Determi- nation of Arsenic, Antimony and Selenium in Environmental Samples. Polish Journal of Environmental Studies. 11(5).9 indexed citations
11.
Niedzielski, Przemysław, et al.. (2002). Occurrence of Arsenic, Antimony and Selenium in Surface Waters of Drawieski National Park. Polish Journal of Environmental Studies. 11(1).6 indexed citations
12.
Siepak, J.. (2001). Badania hydrochemiczne jezior Wielkopolskiego Parku Narodowego. 66. 13–28.1 indexed citations
13.
Niedzielski, Przemysław, J. Siepak, & Marcin Siepak. (2001). Total Content of Arsenic, Antimony and Selenium in Groundwater Samples from Western Poland. Polish Journal of Environmental Studies. 10(5).14 indexed citations
14.
Pełechaty, Mariusz, L. Burchardt, & J. Siepak. (2000). Factors Differentiating the Habitats Occupied by Phytocoenoses of Phragmitetum communis (Gams 1927) Schmale 1939 in Lakes of Wielkopolska Region. Polish Journal of Environmental Studies. 9(5). 409–417.3 indexed citations
15.
Niedzielski, Przemysław, et al.. (1999). Speciation Analysis of Arsenic, Antimony and Selenium in the Surface Waters of Poznari. Polish Journal of Environmental Studies. 8(3).13 indexed citations
16.
Siepak, J., et al.. (1999). Speciation of aluminium released under the effect of acid rain. Polish Journal of Environmental Studies. 8(1).8 indexed citations
17.
Siepak, J., et al.. (1999). The influence of dust emission from the Glogow Copper Foundry on heavy metal concentrations in agrocenoses. Polish Journal of Environmental Studies. 8(2).10 indexed citations
18.
Barałkiewicz, Danuta & J. Siepak. (1999). SPECIATION ANALYSIS OF CHROMIUM(III) AND (VI) IN NATURAL WATER SAMPLES BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY. Chemia Analityczna. 44(5). 879–884.3 indexed citations
19.
Sobczyński, Tadeusz, et al.. (1995). Metale ciezkie w osadach dennych, ich specjacja na drodze ekstrakcji sekwencyjnej. Ekologia i Technika. 3(3). 7–12.7 indexed citations
20.
Barałkiewicz, Danuta & J. Siepak. (1994). The contents and variability of TOC, POC and DOC concentration in natural waters. Polish Journal of Environmental Studies. 3(2).7 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.