Eric Trias Jorge Navas Elena S. Ackley Stephanie Forrest Manuel V. Hermenegildo Negative Ternary Set-Sharing. 301-316 2008 ICLP http://dx.doi.org/10.1007/978-3-540-89982-2_30 conf/iclp/2008 db/conf/iclp/iclp2008.html#TriasNAFH08