@article{TIMB_2014_22_2_a4,
     author = {V. N. Kalachev},
     title = {On the {Hartsfield{\textendash}Ringel} hypothesis: connected unigraphs},
     journal = {Trudy Instituta matematiki},
     pages = {46--52},
     year = {2014},
     volume = {22},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMB_2014_22_2_a4/}
}