International indexing
2. Index Copernicus Journals Master List
4. Central & Eastern European Academic Source (CEEAS)
5. Academic Search Ultimate (EBSCO)
6. CrossRef
7. MIAR
8. WorldCat
9. Bielefeld Academic Search Engine (BASE)
10. National Library of Ukraine named after VI Vernadsky
11. Google Scholar
12. OpenAIRE
13. EuroPub
17. CORE (COnnecting REpositories)
18. Neliti
19. Scilit
20. Ulrich's Periodicals Directory
21. ResearchGate
22. Lens
23. Korea Open Access Platform for Researchers (KOAR)
24. Paperity
25. Dimensions
26. SJSU (California, United States) library
27. Electronic Journals Index, USA
28. Сobiss
29. TIB
30. SLUB
31. DeepDyve
32. China National Knowledge Infrastructure (CNKI)