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