[1] M. Behzad G. Chartrand: Introduction to the Theory of Graphs. Allyn and Bacon, Boston (Мassachusetts) 1971. MR 0432461

[2] F. Harary: Graph Theoгy. Addison-Wesley (Massachusetts) 1969. MR 0256911

[3] I. Havel P. Liebl: O vnoření dichotomického stromu do krychle. Čas. pӗst. mat. 97 (1972), 201-205. MR 0306025

[4] I. Havel P. Liebl: Embedding the polytomic tree into the $n$-cube. Čas. pěst. mat. 98 (1973), 307-314. MR 0325430

[5] I. Havel J. Morávek: B-valuations of graphs. Czech. Math. Journ. 22 (1972), 338-351. MR 0294159

[6] J. Hlavička: Race-free assignment in asynchronous switching circuits. Information Processing Machines No 13, 1967.