Geodesic
A simple construction of semigroups all of whose subsemigroups are left ideals.
Semigroup forum, Tome 4 (1972), pp. 262-266.

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     author = {M. Petrich},
     title = {A simple construction of semigroups all of whose subsemigroups are left ideals.},
     journal = {Semigroup forum},
     pages = {262--266},
     publisher = {mathdoc},
     volume = {4},
     year = {1972},
     zbl = {0261.20053},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133904/}
}
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M. Petrich. A simple construction of semigroups all of whose subsemigroups are left ideals.. Semigroup forum, Tome 4 (1972), pp. 262-266. http://geodesic.mathdoc.fr/item/SF_1972__4_133904/