db/journals/jacm/BeeriFMY83.html On the Desirability of Acyclic Database Schemes Catriel Beeri Ronald Fagin David Maier Mihalis Yannakakis 479-513 J. ACM July 1983 30 3 db/journals/jacm/jacm30.html#BeeriFMY83 http://doi.acm.org/10.1145/2402.322389 JACM/30/P0479.pdf