[1] CHARTRAND G., KAUGARS A., LICK D. R.: Critically n-connected graphs. Proc. Amer. math. Soc. 32, 1972, No. 1, 63-69. MR 0290999 | Zbl 0228.05118

[2] HALIN R.: Studies on minimally n-connected graphs. In: Combinatorial Mathematics and its Applications. Proc. Conf. Oxford, 1969. Academic Press 1971, 129-136. MR 0278980

[3] HARARY F.: Graph theory. Addison-Wesley, Reading, 1969. MR 0256911 | Zbl 0196.27202

[4] LICK D. R.: Critically and minimally n-connected graphs. In: The Many Facets of Graph Theory. Proc. Conf. Kalamazzo, 1968. Springer, Berlin 1969, 199-205. MR 0256916

[5] TUTTE W. T.: Connectivity in graphs. Univ. Press, Toronto 1967. MR 0210617