@article{IVM_2016_2_a2,
     author = {A. V. Gavrikov},
     title = {T-irreducible extension of polygonal digraphs},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {18--23},
     publisher = {mathdoc},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2016_2_a2/}
}