[1] Kim Ki-Hang Butler, J. R. Krabill:
Circulant Boolean relation matrices. Czech. Math. J., 24 (99) (1974), 247-251.
MR 0348017
[2] A. H. Clifford, G. B. Preston:
The algebraic theory of semigroups. Math. Surveys, No.7, Vol. 1, 1961, Amer. Math. Soc., Providence, R. I.
MR 0132791 |
Zbl 0111.03403
[3] Št. Schwarz:
Circulant Boolean relation matrices. Czech. Math. J., 24 (99) (1974), 252-253.
MR 0348018 |
Zbl 0315.15011