Ioannis Avguleas Katerina Gkirtzou Sofia Triantafilou Antonis Bikakis Grigoris Antoniou Efstratios Kontopoulos Nick Bassiliades Visualization of Proofs in Defeasible Logic. 197-210 2008 RuleML http://dx.doi.org/10.1007/978-3-540-88808-6_21 conf/ruleml/2008 db/conf/ruleml/ruleml2008.html#AvguleasGTBAKB08