This map shows the geographic impact of J. Kowalczyk'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. Kowalczyk with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites J. Kowalczyk more than expected).
This network shows the impact of papers produced by J. Kowalczyk. 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. Kowalczyk. The network helps show where J. Kowalczyk may publish in the future.
Co-authorship network of co-authors of J. Kowalczyk
This figure shows the co-authorship network connecting the top 25 collaborators of J. Kowalczyk.
A scholar is included among the top collaborators of J. Kowalczyk 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. Kowalczyk. J. Kowalczyk is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Kowalczyk, J., J. Voigt, J. Michalski, M. Czauderna, & G. M. Crovetto. (2010). Efficiency of endogenous urea nitrogen incorporation into the ruminal bacteria and milk protein in goats fed diet differentiated in protein level.. 141–142.1 indexed citations
5.
Kowalczyk, J., Paweł Markiewicz, & J. Matras. (2009). Intra-population variability of Picea abies from Zwierzyniec Lubelski and Blizyn (Poland).. Dendrobiology. 61. 69–77.2 indexed citations
6.
Gajewska, Alina, et al.. (2009). Direct Liquid Chromatography with Photodiode and Fluorescence Detection for Simultaneous Quantification of Gonadotropin-Releasing Hormone (GnRH), Its Complex with Cu2+, and Catabolites. Polish Journal of Chemistry. 83(3). 383–390.1 indexed citations
7.
Kowalczyk, J., et al.. (2009). Stan poznania pszczol [Hymenoptera, Apoidea, Apiformes] Parku Krajobrazowego Wzniesien Lodzkich. Parki Narodowe i Rezerwaty Przyrody. 28(4). 41–55.1 indexed citations
8.
Kowalczyk, J., et al.. (2009). The state of knowledge on the bees (Hymenoptera, Apoidea, Apiformes) of the Wzniesienia Łódzkie Landscape Park.. Parki Narodowe i Rezerwaty Przyrody. 28(4). 41–55.2 indexed citations
9.
Kowalczyk, J., et al.. (2009). Aculeata (Hymenoptera) of the "Polana Siwica" reserve and adjacent areas in the Bolimowski Landscape Park.. Parki Narodowe i Rezerwaty Przyrody. 28(4). 25–40.1 indexed citations
10.
Kowalczyk, J., et al.. (2009). Zadlowki [Hymenoptera, Aculeata] rezerwatu 'Polana Siwica' i terenow przyleglych w Bolimowskim Parku Krajobrazowym. Parki Narodowe i Rezerwaty Przyrody. 28(4). 25–40.1 indexed citations
Kowalczyk, J., et al.. (2002). Materialy do poznania nastecznikowatych Polski [Hymenoptera: Aculeata: Pampilidae] Cz. II. Rodzaje: Priocnemis, Arachnospila i Evagetes z kolekcji Jana K.Kowalczyka. Parki Narodowe i Rezerwaty Przyrody. 21(1). 39–49.1 indexed citations
13.
Kowalczyk, J., et al.. (2001). Osy [Hymenoptera, Vespoidea] terenow porolnych zachodniej czesci Kampinoskiego Parku Narodowego.. 6. 71–76.1 indexed citations
14.
Kowalczyk, J., et al.. (2001). Nitela fallax KOHL,1883 [Hymenoptera: Sphecoidea] w Polsce. Wiadomości Entomologiczne. 20. 143–146.1 indexed citations
15.
Czauderna, M., et al.. (1999). DETERMINATION OF 2,6-DIAMINOPIMELIC ACID IN RUMEN BACTERIA BY VARIOUS HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY METHODS WITH PRE-COLUMN DERIVATIZATION. Chemia Analityczna. 44(2). 243–255.3 indexed citations
16.
Kowalczyk, J. & J. Matras. (1999). Wyniki doswiadczenia proweniencyjnego z modrzewiem europejskim [Larix decidua Mill.]. Sylwan. 143(3). 43–59.1 indexed citations
17.
Kowalczyk, J., et al.. (1998). Nowe dla Polski gatunki grzebaczy [Hymenoptera: Aculeata: Sphecidae] oraz nowe stanowiska gatunkow rzadkich. 219–222.1 indexed citations
18.
Kowalczyk, J., et al.. (1998). Materialy do poznania nastecznikowatych Polski [Hymenoptera: Aculeata: Pompilidae]. 251–260.1 indexed citations
Kowalczyk, J. & Cezary Watała. (1991). Interesujące muchówki (Diptera: Syrphidae, Conopidae) Łodzi i okolicy. 35.1 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.