@article{DBLP:journals/toplas/AptP94,
author = {Krzysztof R. Apt and
Alessandro Pellegrini},
title = {On the Occur-Check-Free Prolog Programs},
journal = {ACM Trans. Program. Lang. Syst.},
volume = {16},
number = {3},
year = {1994},
pages = {687-726},
ee = {http://doi.acm.org/10.1145/177492.177673},
bibsource = {DBLP, http://dblp.uni-trier.de}
}