[1] J. Grossman, F. Harary and M. Klawe: Generalized ramsey theory for graphs $X$: Double stars. Discrete Math. 28 (1979), 247–254. DOI 10.1016/0012-365X(79)90132-8 | MR 0548624

[2] S. L. Hakimi: On the realizability of a set of integers as degrees of the vertices of a graph. J. SIAM Appl. Math. 10 (1962), 496–506. DOI 10.1137/0110037 | MR 0148049

[3] F. Harary: On the notion of balance in a signed graph. Michigan Math. J. 2 (1953), 143–146. DOI 10.1307/mmj/1028989917 | MR 0067468

[4] F. Harary: Graph Theory. Addison-Wesley, Reading, 1969. MR 0256911 | Zbl 0196.27202

[5] V. Havel: A remark on the existence of finite graphs. Časopis Pěst. Mat. 80 (1955), 477–480. (Czech)