The University of Tokyo was listed 13th in a world ranking of citations from research essays covering the 11 years to 2005, the Japan office of Thomson Corp. of the U.S. said Monday.

Among other Japanese institutes, Kyoto University was 31st on the list, followed by Osaka University at 35th and Tohoku University at 72nd, according to Thomson Corporation K.K., which only gave the rankings of Japanese universities.