@article{PDM_2016_2_a7,
     author = {V. N. Salii},
     title = {On the number of {Sperner} vertices in a~tree},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {115--118},
     publisher = {mathdoc},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2016_2_a7/}
}