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Wichs, Tomáš
On minimal semirigid relations. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 2, pp. 359-365
MSC: 05-04, 05C20, 05C25, 05C99 | MR 0284355 | Zbl 0214.51203
References:
[1] V. CHVÁTAL: On finite and countable rigid graphs and tournaments. Comment. Math. Univ. Carolinae 6 (1965), 429-438. MR 0190023
[2] Z. HEDRLÍN, A. PULTR: Symmetric relations (undirected graphs) with given semigroups. Monatshefte f. Mathem. 69, 4 (1966), 377-400. MR 0202797
[3] P. HELL, J. NEŠETŘIL: Rigid and inverse rigid graphs, Combinatorial structures and their applications. Gordon and Breach, New York 1970, 169-172.
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