@article{MZM_1997_62_6_a9,
     author = {D. V. Paduchikh},
     title = {The impact of 2-neighborhoods on graph structure},
     journal = {Matemati\v{c}eskie zametki},
     pages = {892--897},
     year = {1997},
     volume = {62},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_62_6_a9/}
}