Geodesic
The number of subsemigroups of certain semigroups
Portugaliae mathematica, Tome 23 (1964) no. 4, pp. 183-191.

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Keywords: group theory 
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     author = {Tamura, T. and Merkel, R.B.},
     title = {The number of subsemigroups of certain semigroups},
     journal = {Portugaliae mathematica},
     pages = {183--191},
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     volume = {23},
     number = {4},
     year = {1964},
     mrnumber = {0201551},
     zbl = {0133.27702},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1964__23_4_114930/}
}
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Tamura, T.; Merkel, R.B. The number of subsemigroups of certain semigroups. Portugaliae mathematica, Tome 23 (1964) no. 4, pp. 183-191. http://geodesic.mathdoc.fr/item/PORMA_1964__23_4_114930/