@article{DAN_1987_293_1_a4,
     author = {A. I. Gol'berg and V. A. Gurvich},
     title = {On the maximal number of edges for a graph with $n$ vertices in},
     journal = {Doklady Akademii Nauk},
     pages = {27--32},
     publisher = {mathdoc},
     volume = {293},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_1_a4/}
}