On the structure of semigroups which are unions of groups.
Semigroup forum, Tome 5 (1972), pp. 323-330.

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     author = {R.J. Warne},
     title = {On the structure of semigroups which are unions of groups.},
     journal = {Semigroup forum},
     pages = {323--330},
     publisher = {mathdoc},
     volume = {5},
     year = {1972},
     zbl = {0275.20107},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133949/}
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R.J. Warne. On the structure of semigroups which are unions of groups.. Semigroup forum, Tome 5 (1972), pp. 323-330. http://geodesic.mathdoc.fr/item/SF_1972__5_133949/