Pietro Baroni Massimiliano Giacomin Comparing Argumentation Semantics with Respect to Skepticism. 210-221 2007 conf/ecsqaru/2007 ECSQARU http://dx.doi.org/10.1007/978-3-540-75256-1_21 db/conf/ecsqaru/ecsqaru2007.html#BaroniG07