Andreia Malucelli Eugenio Oliveira Daniel Palzer Combining Ontologies and Agents to help in Solving the Heterogeneity Problem in E-Commerce Negotiations. 26-38 2005 conf/deec/2005 DEEC http://doi.ieeecomputersociety.org/10.1109/DEEC.2005.6 db/conf/deec/deec2005.html#MalucelliOP05