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Ala' Hawash Anton Deik Bilal Farraj Mustafa Jarrar Towards query optimization for the data web: <i>disk-based algorithms: trace equivalence and bisimilarity</i>. 17 2010 ISWSA http://doi.acm.org/10.1145/1874590.1874607 conf/iswsa/2010 db/conf/iswsa/iswsa2010.html#HawashDFJ10