Pearson Longman English Language Teaching (Pearson Longman ELT) is a leading educational publisher of quality resources for all ages and abilities across the curriculum, providing solutions for teachers and students.
Y. Song, L. Zhang, und C. Giles. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge mining, Seite 93--102. New York, NY, USA, ACM, (2008)