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Kala, V. ; Kepka, Tomáš ; Phillips, J. D.
Various subsemirings of the field $\Bbb Q$ of rational numbers. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 50 (2009), issue 1, pp. 29-59
MSC: 16Y60 | MR 2569468 | Zbl 1192.16044
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