Muhammad Javed Yalemisew M. Abgaz Claus Pahl A Pattern-Based Framework of Change Operators for Ontology Evolution. 544-553 2009 OTM Workshops http://dx.doi.org/10.1007/978-3-642-05290-3_68 conf/otm/2009-w db/conf/otm/otm2009-w.html#JavedAP09