Andreia Malucelli Daniel Palzer Eugénio C. Oliveira Ontology-based Services to help solving the heterogeneity problem in e-commerce negotiations. 29-43 2006 5 Electronic Commerce Research and Applications 1 http://dx.doi.org/10.1016/j.elerap.2005.08.002 db/journals/ecra/ecra5.html#MalucelliPO06