[1] BERGE, C: Graphs and Hypeгgгaphs. Noгth Holland, Amsterdam-London, 1973, 396-397.
[2] HARARY F.: 
Gгaph Theoгy. Addison-Wesley, Reading, Mass., 1969. 
MR 0256911[3] PIPPENGER N., GOLUMBIC M. CH.: 
The Inducibility of a Gгaph. J. Comb. Theoгy (B)19, 1975, 189-203. 
MR 0401552