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• Acta Universitatis Carolinae. Mathematica et Physica
• Volume 50

Author: Kala, V.

• 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