1. SCI;A. Wróblewska,2012
2. SYNAT system ontology, http://wizzar.ii.pw.edu.pl/passim-ontology/
3. System and Domain Ontologies in PASSIM project. Design of the system for building and development ontologies. Technical Report B12 in SYNAT project, Institute of Computer Science, WUT (September 2011)
4. Lecture Notes in Artificial Intelligence;Y. Sure,2005
5. FOAF Vocabulary Specification 0.98. Namespace Document - Marco Polo Edition (August 9, 2010), http://xmlns.com/foaf/spec/