Manuel Bodirsky, Peter Jonsson, Timo von Oertzen. Horn versus full first-order: Complexity dichotomies in algebraic constraint satisfaction. Journal of Logic and Computation, 22(3):643-660, 2012. [doi]
@article{BodirskyJO12,
title = {Horn versus full first-order: Complexity dichotomies in algebraic constraint satisfaction},
author = {Manuel Bodirsky and Peter Jonsson and Timo von Oertzen},
year = {2012},
doi = {10.1093/logcom/exr011},
url = {http://dx.doi.org/10.1093/logcom/exr011},
researchr = {https://researchr.org/publication/BodirskyJO12},
cites = {0},
citedby = {0},
journal = {Journal of Logic and Computation},
volume = {22},
number = {3},
pages = {643-660},
}