[1] BOSÁK J.: Grahps with unique walks, trails or paths of given lengths. In: Theory and Applications of graphs (Proc. Conf. Kalamazoo 1976), Springer-Veгlag, Berlin 1978, 75-85.

[2] BOSÁK J.: Geodetic graphs. In: Combinatorics (Proc. Colloq. Keszthely 1976), North Holland, Amsterdam 1978, 151-172. MR 0519262

[3] BOSÁK J.: Partially directed Moore graphs. Math. Slovaca, 29, 1979, 181-196. MR 0578291 | Zbl 0407.05057

[4] BOSÁK J., KOTZIG A., ZNÁM Š.: Strongly geodetic graphs. J. Combinat. Theory, 5, 1968, 170-176. MR 0228365 | Zbl 0165.26602

[5] BOSÁK J.: On the k-index of graphs. Discгete Math., 1, 1971, 133-146. MR 0292706 | Zbl 0219.05079

[6] HARARY F.: Graph Theory. Addison-Wesley, Reading, Mass. 1969. MR 0256911 | Zbl 0196.27202

[7] HÍC P.: On paгtially directed geodetic graphs. Math. Slovaca, 32, 1982, 255-262. MR 0670001

[8] HOFFMAN A. J., SINGLETON R. R.: On Moore graphs with diameters 2 and 3. IBM J. Res. Develop. 4, 1960, 497-504. MR 0140437 | Zbl 0096.38102

[9] PLESNÍK J.: One method foг proving the impossibility of certain Moore graphs. Discrete Math., 8, 1974, 363-376. MR 0342433

[10] PLESNÍK J., ZNÁM Š.: Strongly geodetic dirteted graphs. Acta Fac. Rerum Natur. Univ Comenian Math., 9, 1974, 455-465 MR 0363991