@article{AUCMP_2009__50_1_a2,
     author = {Fla\v{s}ka, V\'aclav and Kepka, Tom\'a\v{s} and Kortelainen, Juha},
     title = {On separating sets of words. {II.}},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {15--28},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {2009},
     mrnumber = {2569467},
     zbl = {1189.68088},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_2009__50_1_a2/}
}