@article{PDM_2009_10_a50,
     author = {A. A. Dolgov},
     title = {On exact extensions of tournaments},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {98},
     publisher = {mathdoc},
     number = {10},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2009_10_a50/}
}