אתרים דומים ist.ac.at:
roblox.com 
520,900

academia.edu 
507,519

nature.com 
436,775

sciencedaily.com 
259,491

vt.edu 
247,593

tufts.edu 
194,012

thermofisher.com 
164,651

omicsonline.org 
150,866

uoguelph.ca 
150,488

newatlas.com 
140,138

cern.ch 
127,932

quia.com 
123,570

newscientist.com 
117,587

nap.edu 
108,952

io9.com 
100,049

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