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Shosuke Sato Michiaki Tatsubori Fumihiko Imamura Mass and social media corpus analysis after the 2011 great east Japan earthquake. 711-712 2012 WWW (Companion Volume) https://doi.org/10.1145/2187980.2188188 conf/www/2012c db/conf/www/www2012c.html#SatoTI12