@article{PDMA_2012_5_a43,
     author = {M. B. Abrosimov and O. V. Modenova},
     title = {On digraphs with a~small number of arcs in a~minimal $1$-vertex extension},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {86--88},
     publisher = {mathdoc},
     number = {5},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2012_5_a43/}
}