In this paper, we study the algebraically closed structures and the existentially closed structures in the class of commutative archimedean semigroups (with an idempotent).
@article{RLINA_1979_8_67_3-4_162_0, author = {Carlo Toffalori}, title = {Semigruppi archimedei esistenzialmente chiusi}, journal = {Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti}, volume = {66}, year = {1979}, pages = {162-167}, zbl = {0456.20031}, language = {it}, url = {http://dml.mathdoc.fr/item/RLINA_1979_8_67_3-4_162_0} }
Toffalori, Carlo. Semigruppi archimedei esistenzialmente chiusi. Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti, Tome 66 (1979) pp. 162-167. http://gdmltest.u-ga.fr/item/RLINA_1979_8_67_3-4_162_0/
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