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Communicated by H.-J. Hoehnke
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Fröberg, R., Gottlieb, C. & Häggkvist, R. On numerical semigroups. Semigroup Forum 35, 63–83 (1986). https://doi.org/10.1007/BF02573091
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DOI: https://doi.org/10.1007/BF02573091