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Author: Niemenmaa, Markku

• Šmarda, Bohumil; Niemenmaa, Markku: Normal subgroups as ideals. (English). Archivum Mathematicum, vol. 19 (1983), issue 2, pp. 109-111
• Niemenmaa, Markku: A note on systems of ideals. (English). Archivum Mathematicum, vol. 18 (1982), issue 2, pp. 89-90