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References:
[1] Birkhoff G.: An extended arithmetic. Duke Math. Journ. 3 (1937), 311-316 MR 1545989 | Zbl 0016.38702
[2] Birkhoff G.: Generalized arithmetic. Duke Math. Journ. 9 (1942), 283-302. MR 0007031 | Zbl 0060.12609
[3] Novák V.: Cyclically ordered sets. Czech Math. Journ. 32 (1982), 460-473. MR 0669787
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