no. 4
A game of composing binary relations
RAIRO. Informatique théorique, Tome 16 (1982) no. 4, pp. 365-369 
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     author = {Goral\v{C}{\'\i}k, P. and Hedrl{\'\i}n, Z. and Koubek, V. and Ry\v{s}unkov\'a, J.},
     title = {A game of composing binary relations},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {365--369},
     year = {1982},
     publisher = {EDP Sciences},
     volume = {16},
     number = {4},
     mrnumber = {707637},
     zbl = {0509.05011},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1982__16_4_365_0/}
}
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GoralČík, P.; Hedrlín, Z.; Koubek, V.; Ryšunková, J. A game of composing binary relations. RAIRO. Informatique théorique, Tome 16 (1982) no. 4, pp. 365-369. https://www.numdam.org/item/ITA_1982__16_4_365_0/

1. J.-E. Pin, Le problème de la synchronisation et la conjecture de Černý, in A. DELUCA, Ed., Non Commutative Structures in Algebra and Geometrie Combinatories, C.N.R., 1978, pp. 46-58.

2. W. Schwarz, Einführung in Methoden und Ergebnisse der Primzahltheorie, BI-Hochschultaschenbuch, 278/278a, Mannheim, 1969. | Zbl | MR