This map shows the geographic impact of V D Petkov'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 V D Petkov with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites V D Petkov more than expected).
This network shows the impact of papers produced by V D Petkov. 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 V D Petkov. The network helps show where V D Petkov may publish in the future.
Co-authorship network of co-authors of V D Petkov
This figure shows the co-authorship network connecting the top 25 collaborators of V D Petkov.
A scholar is included among the top collaborators of V D Petkov 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 V D Petkov. V D Petkov is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Petkov, V D, et al.. (1994). Effects of agonists and antagonists of some serotonin-receptor subtypes on memory and their modulation by the 5-HT-uptake inhibitor fluoxetine.. PubMed. 20(3-4). 83–90.6 indexed citations
Petkov, V D, et al.. (1991). Modulation of the effects on learning and memory of nootropic drugs and central stimulants when applied together.. PubMed. 17(4). 17–26.1 indexed citations
6.
Petkov, V D, et al.. (1991). Changes in brain muscarinic and beta-adrenoreceptors of the offspring of ethanol-consuming mothers (experiments on rats).. PubMed. 17(2-3). 91–7.2 indexed citations
Petkov, V D, et al.. (1990). Age-related differences in memory and in the memory effects of nootropic drugs.. PubMed. 16(2). 28–36.18 indexed citations
9.
Petkov, V D, et al.. (1990). Study of the effects of nootropic agents on the adrenergic neurotransmission in smooth muscles of young and old animals.. PubMed. 16(1). 38–45.3 indexed citations
10.
Petkov, V D, et al.. (1990). Effects of nootropic agents on the performing of active two-way avoidance tasks in young and old rats.. PubMed. 16(3). 35–42.1 indexed citations
11.
Petkov, V D, et al.. (1990). Changes in the synapses in the parietal cortex of senescent rats.. PubMed. 16(4). 42–9.2 indexed citations
Petkov, V V, et al.. (1985). Effects of meclofenoxate on the level and turnover of biogenic monoamines in the rat brain.. PubMed. 35(12). 1778–81.6 indexed citations
20.
Petkov, V D, et al.. (1984). Changes in the brain biogenic monoamines of rats, induced by piracetam and aniracetam.. PubMed. 10(4). 6–15.17 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.