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On minimal semirigid relations
Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 2, pp. 359-365 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Classification : 05-04, 05C20, 05C25, 05C99 
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Wichs, Tomáš. On minimal semirigid relations. Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 2, pp. 359-365. http://geodesic.mathdoc.fr/item/CMUC_1971_12_2_a11/

[1] V. CHVÁTAL: On finite and countable rigid graphs and tournaments. Comment. Math. Univ. Carolinae 6 (1965), 429-438. | MR

[2] Z. HEDRLÍN, A. PULTR: Symmetric relations (undirected graphs) with given semigroups. Monatshefte f. Mathem. 69, 4 (1966), 377-400. | MR

[3] P. HELL, J. NEŠETŘIL: Rigid and inverse rigid graphs, Combinatorial structures and their applications. Gordon and Breach, New York 1970, 169-172.