%0 Journal Article 
%F gls2001
%A Gottlob, Georg
%A Leone, Nicola
%A Scarcello, Francesco
%T The complexity of acyclic conjunctive queries
%J J. ACM
%V 48
%N 3
%P 431-498
%I ACM
%C New York, NY, USA
%U http://doi.acm.org/10.1145/382780.382783
%D 2001
%K dbprog