Víctor Dalmau. There are no pure relational width 2 constraint satisfaction problems. Inf. Process. Lett., 109(4):213-218, 2009. [doi]
@article{Dalmau09,
title = {There are no pure relational width 2 constraint satisfaction problems},
author = {Víctor Dalmau},
year = {2009},
doi = {10.1016/j.ipl.2008.10.005},
url = {http://dx.doi.org/10.1016/j.ipl.2008.10.005},
tags = {constraints},
researchr = {https://researchr.org/publication/Dalmau09},
cites = {0},
citedby = {0},
journal = {Inf. Process. Lett.},
volume = {109},
number = {4},
pages = {213-218},
}