A. Popescu, and M. Pennacchiotti. Proceedings of the 19th ACM international conference on Information and knowledge management, page 1873--1876. New York, NY, USA, ACM, (2010)
M. Pennacchiotti, and A. Popescu. Proceedings of the 17th ACM SIGKDD international conference on Knowledge discovery and data mining, page 430--438. New York, NY, USA, ACM, (2011)