Bulgaria

Research

Date range: 1 June 2022 - 31 May 2023

Subject/journal group: All

The table to the right includes counts of all research outputs for Bulgaria published between 1 June 2022 - 31 May 2023 which are tracked by the Nature Index.

Hover over the donut graph to view the Share for each subject. Below, the same research outputs are grouped by subject. Click on the subject to drill-down into a list of articles organized by journal, and then by title.

Note: Articles may be assigned to more than one subject area.

Article Count and Share for Bulgaria
Count Share
106 12.69

Outputs by subject (Share)

Outputs by subject
Subject Count Share
13 0.71
15 3.77
6 0.22
18 0.72
61 7.53

Share output for the past 5 years

Share per year
2018 2019 2020 2021 2022*
13.62 15.24 9.74 13.89 13.31

Compare Bulgaria with other countries/territories

*Note: 2022 data contains Share for article affiliations from newly added health sciences journals.

Collaboration

View the connected world of international research collaboration. Visualize collaborations by subject or region.

Collaborations between countries

Date range: 1 June 2022 - 31 May 2023

Collaboration by percentage of Share

Hover over the graph to view collaboration by percentage of Share.

Collaboration by percentage of Share
Country Share (%)
USA 28.45
Germany 20.75
Italy 11.58
China 7.27
UK 6.92
Spain 5.87
Russia 5.67
Switzerland 5.45
France 4.71
Belgium 3.35

Top 10 collaborators with Bulgaria by Share

  1. Bulgaria and United States of America (USA) (22.67)
    Bulgaria2.51
    United States of America (USA)20.16
  2. Bulgaria and Germany (16.54)
    Bulgaria2.63
    Germany13.91
  3. Bulgaria and Italy (9.23)
    Bulgaria0.88
    Italy8.35
  4. Bulgaria and China (5.79)
    Bulgaria0.72
    China5.07
  5. Bulgaria and United Kingdom (UK) (5.52)
    Bulgaria1.31
    United Kingdom (UK)4.21
  6. Bulgaria and Spain (4.67)
    Bulgaria1.04
    Spain3.63
  7. Bulgaria and Russia (4.52)
    Bulgaria0.69
    Russia3.83
  8. Bulgaria and Switzerland (4.34)
    Bulgaria0.49
    Switzerland3.85
  9. Bulgaria and France (3.75)
    Bulgaria0.84
    France2.91
  10. Bulgaria and Belgium (2.67)
    Bulgaria0.60
    Belgium2.07

Collaboration is determined by the combined fractional count (Share) of Bulgaria and the collaborating country.

Top 10 institutions from Bulgaria by Share

Institution Count Share
1. Bulgarian Academy of Sciences (BAS) 61 6.03
2. Sofia University St. Kliment Ohridski 57 5.42
3. Medical University of Sofia 7 0.30
4. Technical University of Sofia 3 0.26
5. Center of Plant Systems Biology and Biotechnology (CPSBB) 2 0.20
6. St. Ivan Rilski University Hospital 1 0.14
7. Medical University of Plovdiv 2 0.07
8. National Center of Infectious and Parasitic Diseases (NCIPD) 2 0.07
9. National Cardiology Hospital - Sofia 2 0.06
10. National Historical Museum 1 0.04

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