Geodesic
On the maximal number of edges for a graph with $n$ vertices in
Doklady Akademii Nauk, Tome 293 (1987) no. 1, pp. 27-32 
A. I. Gol'berg; V. A. Gurvich. On the maximal number of edges for a graph with $n$ vertices in. Doklady Akademii Nauk, Tome 293 (1987) no. 1, pp. 27-32. http://geodesic.mathdoc.fr/item/DAN_1987_293_1_a4/
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     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},
     year = {1987},
     volume = {293},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_1_a4/}
}
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