@Article{LL09,
author= {La Scala, Roberto and Levandovskyy, Viktor},
title={Letterplace ideals and non-commutative {G}r{\"o}bner bases.},
journal=JSC,
volume={44},
number={10},
pages="1374--1393",
year={2009},
doi={doi:10.1016/j.jsc.2009.03.002}
}