How does Google Scholar rate and rank articles?

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Tags

1. #weighing
2. #allow
3. #researchers
4. #search
5. #academic
6. #author
7. #publication
8. #combined
9. #databases
10. #ranks
11. #while
12. #counts
13. #factor
14. #which
15. #select
16. #algorithm
17. #google
18. #scholar
19. #results
20. #users
21. #article
22. #citation
23. #engines
24. #ranking
25. #relevance