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IBM Systems Journal
A system for measuring audiences of outdoor advertising in specific areas is based on the combination of mobile phone location estimations with Internet listings of social events. © 2011 IEEE.
M.F. Cowlishaw
IBM Systems Journal
Oliver Bodemer
IBM J. Res. Dev
György E. Révész
Theoretical Computer Science
Frank R. Libsch, S.C. Lien
IBM J. Res. Dev