@article{CDC+04,
author = "D A. Cohen and M C. Cooper and P G. Jeavons and A A. Krokhin",
journal = "Journal of Artificial Intelligence Research",
pages = "1-22",
title = "{A} {M}aximal {T}ractable {C}lass of {S}oft                    {C}onstraints",
volume = "22",
year = "2004",
}