@article{DBLP:journals/jacm/Klug88,
author = {Anthony C. Klug},
title = {On conjunctive queries containing inequalities},
journal = {J. ACM},
volume = {35},
number = {1},
year = {1988},
pages = {146-160},
ee = {http://doi.acm.org/10.1145/42267.42273},
bibsource = {DBLP, http://dblp.uni-trier.de}
}