@article{TM_2011_274_a7,
     author = {Juhani Karhum\"aki and Aleksi Saarela},
     title = {On maximal chains of systems of word equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {130--136},
     publisher = {mathdoc},
     volume = {274},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2011_274_a7/}
}