Adding or removing an element from a pseudo-symmetric numerical semigroup
Bollettino della Unione matematica italiana, Série 8, 9B (2006) no. 3, pp. 681-696.

Voir la notice de l'article dans Biblioteca Digitale Italiana di Matematica

Se $S$ è un semigruppo numerico pseudo-simmetrico, se $g$ è il suo numero di Frobenius e se $x$ è un generatore minimo di $S$ allora anche $S \cup \{g\}$, $S \setminus \{g\}$ e $S \cup \{\frac{1}{2}g, g\}$ sono semigruppi numerici. In questo lavoro ci proponiamo di studiare tali costruzioni. 
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Rosales, J. C. Adding or removing an element from a pseudo-symmetric numerical semigroup. Bollettino della Unione matematica italiana, Série 8, 9B (2006) no. 3, pp. 681-696. https://geodesic-test.mathdoc.fr/item/BUMI_2006_8_9B_3_a10/

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