Semigroups in which each -class contains at most one regular ...-class.
Semigroup forum, Tome 15 (1977), pp. 91-92.

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@article{SF_1977__15_134238,
     author = {K. D. jr. Magill},
     title = {Semigroups in which each      -class contains at most one regular ...-class.},
     journal = {Semigroup forum},
     pages = {91--92},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0372.54035},
     url = {http://geodesic.mathdoc.fr/item/SF_1977__15_134238/}
}
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K. D. jr. Magill. Semigroups in which each      -class contains at most one regular ...-class.. Semigroup forum, Tome 15 (1977), pp. 91-92. http://geodesic.mathdoc.fr/item/SF_1977__15_134238/