@book{DBLP:books/daglib/0070404, title = {Wissensrepr{\"{a}}sentation und Inferenz - eine grundlegende Einf{\"{u}}hrung}, author = {Bibel, Wolfgang and H{\"{o}}lldobler, Steffen and Schaub, Torsten}, publisher = {Vieweg}, series = {Artificial Intelligence}, year = {1993} }