%0 Journal Article %A P. V. Martyugin %T Lower bounds for the length of the shortest carefully synchronizing words for two- and three-letter partial automata %J Diskretnyj analiz i issledovanie operacij %D 2008 %P 44-56 %V 15 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DA_2008_15_4_a3/ %G ru %F DA_2008_15_4_a3