Grzegorz Skorupa Radoslaw Katarzyniak Towards a Model for Extraction of Possible Worlds and Accessibility Relation from Cognitive Agent's Experience. 301-308 2009 ICCCI http://dx.doi.org/10.1007/978-3-642-04441-0_26 conf/iccci/2009 db/conf/iccci/iccci2009.html#SkorupaK09