db/conf/cikm/LehmannC94.html Fritz Lehmann Anthony G. Cohn The EGG/YOLK Reliability Hierarchy : Semantic Data Integration Using Sorts with Prototypes. 272-279 CIKM1994/P272.pdf 1994 conf/cikm/94 CIKM db/conf/cikm/cikm94.html#LehmannC94 http://doi.acm.org/10.1145/191246.191293