Luís Sarmento Paulo Trezentos João Pedro Gonçalves Eugénio C. Oliveira Inferring local synonyms for improving keyword suggestion in an on-line advertisement system. 37-45 2009 KDD Workshop on Data Mining and Audience Intelligence for Advertising http://doi.acm.org/10.1145/1592748.1592754 conf/kdd/2009adkdd db/conf/kdd/adkdd2009.html#SarmentoTGO09