@article{IVM_1978_2_a15,
     author = {N. P. Titov},
     title = {A~graph-scheme of the coherence problem},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {105--108},
     publisher = {mathdoc},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1978_2_a15/}
}