David Poole Clinton Smyth Rita Sharma Semantic Science: Ontologies, Data and Probabilistic Theories. 26-40 2008 URSW (LNCS Vol.) http://dx.doi.org/10.1007/978-3-540-89765-1_2 conf/semweb/2007ursw-lncs db/conf/semweb/lncs5327.html#PooleSS08