@article{PDM_2010_12_a31,
     author = {M. B. Abrosimov},
     title = {On minimal edge $k$-extensions of oriented stars},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {67--68},
     year = {2010},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2010_12_a31/}
}