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Link to original content: https://dblp.dagstuhl.de/rec/conf/stoc/BeeriFMMUY81.xml
Properties of Acyclic Database Schemes Catriel Beeri Ronald Fagin David Maier 0001 Alberto O. Mendelzon Jeffrey D. Ullman Mihalis Yannakakis 355-362 conf/stoc/STOC13 1981 STOC db/conf/stoc/stoc81.html#BeeriFMMUY81 https://doi.org/10.1145/800076.802489