@article{DMTCS_2012_14_1_a1,
     author = {Kufleitner, Manfred and Lauser, Alexander},
     title = {The {Join} of the {Varieties} of {R-trivial} and {L-trivial} {Monoids} via {Combinatorics} on {Words}},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2012},
     doi = {10.46298/dmtcs.564},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.564/}
}