* separar palavras-chave com vírgula
Melhores sites academics 1-15:
1.
academia.edu 
507,519

2.
umich.edu 
289,596

3.
utah.edu 
237,920

4.
mendeley.com 
236,393

5.
usf.edu 
193,873

6.
ua.edu 
89,721

7.
metu.edu.tr 
70,891

8.
researchmap.jp 
53,328

9.
nmsu.edu 
52,476

10.
wtamu.edu 
37,918

11.
fgcu.edu 
25,513

12.
careerage.com 
23,544

13.
davidson.edu 
19,272

14.
sheir.org 
16,823

15.
uncp.edu 
14,961

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