scholar.google.com
scholar.google.net
scholar.google.org
scholar.google.co
scholar.google.io
scholar.google.us
scholar.google.at
scholar.google.nz
scholar.google.be
scholar.google.se
scholar.google.cl
scholar.google.si
scholar.google.ею
scholar.google.ua
scholar.google.рф
scholar.google.co.us

google.co.us

Extension: .co.us