Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

• E. Semkov42 · h 26
• R. Bachev41 · h 33
• R. Zamanov36 · h 16
• K. Stoyanov34 · h 10
• A. Strigachev31 · h 29
• D. Dimitrov3 profiles31 · h 15
• R. Konstantinova-Antova31 · h 19
• S. Peneva29 · h 15
• M. Aurière28 · h 37
• S. Ibryamov27 · h 16
• P. Petit2 profiles24 · h 46
• S. Boeva2 profiles23 · h 12

• Bulgarian Academy of SciencesBG224 papers
• Centre National de la Recherche ScientifiqueFR67 papers
• Sofia University "St. Kliment Ohridski"BG64 papers
• Shumen UniversityBG62 papers
• Instituto de Astrofísica de CanariasES57 papers
• Instituto de Astrofísica de AndalucíaES55 papers
• National Institute for AstrophysicsIT54 papers
• Universidad de La LagunaES50 papers
• Astronomical ObservatoryRS48 papers
• Evgeni Kharadze Georgian National Astrophysical ObservatoryGE45 papers
• Aryabhatta Research Institute of Observational SciencesIN43 papers
• Osservatorio Astrofisico di TorinoIT43 papers