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1. Academic Keys
2. Advanced Science Index
3. African Quality Centre for Journals
4. Central and Eastern European Online Library
5. CFPlist
6. Cite Factor
7. Cosmos Impact Factor
8. Crossref
9. Directory of Abstract Indexing for Journals
10. Directory of Indexing and Impact Factor
11. DOI
12. Electronic Journals Library
13. Eurasian Scientific Journal Index
14. General Impact Factor
15. Global Impact Factor
16. GSCIF
17. IIFS
18. IIJIF
19. IJindex
20. Infobase Index
21. International Institute of Organized Research
22. International Scientific Indexing
23. International Institute for Research Impact Factor Journals
24. ISIFI
25. ISRA
26. Jour Informatics
27. Journalseeker
28. JournalTOCs
29. Oajournals
30. Quality Factor
31. Scholar Impact
32. Scholarsteer
33. Science Impact Factor
34. Science Library Index
35. Scientific World Index
36. Sindexs
37. SIS
38. SJIF
39. Sjournals Index
40. Universal Impact Factor
41. World Catalogue of Scientific Journals
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