אתרים דומים ist.ac.at:
roblox.com 
16,875,000

academia.edu 
492,401

nature.com 
436,775

vt.edu 
247,593

tufts.edu 
194,012

uoguelph.ca 
150,488

quia.com 
128,347

cern.ch 
127,932

newscientist.com 
117,587

nap.edu 
108,952

iaea.org 
81,922

nobelprize.org 
70,100

kriesi.at 
62,418

omicsonline.org 
52,869

science.gov 
47,509

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