@article{ISU_2013_13_2_a0,
     author = {M. B. Abrosimov and O. V. Modenova},
     title = {Characterization of graphs with a~small number of additional arcs in a~minimal $1$-vertex extension},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {3--9},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2013_13_2_a0/}
}