@article{AUCMP_2010__51_1_a5,
     author = {Fla\v{s}ka, V\'aclav and Kepka, Tom\'a\v{s} and Kortelainen, Juha},
     title = {On separating sets of words. {IV.}},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {65--71},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {2010},
     mrnumber = {2789276},
     zbl = {1217.68170},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_2010__51_1_a5/}
}