%0 Journal Article %A V. N. Kalachev %T On the Hartsfield--Ringel hypothesis: connected unigraphs %J Trudy Instituta matematiki %D 2014 %P 46-52 %V 22 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMB_2014_22_2_a4/ %G ru %F TIMB_2014_22_2_a4