Idempotent Topological Groupoids with Non-Empty Center.
Mathematische Zeitschrift, Tome 125 (1972), pp. 70-78.

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@article{MZ_1972__125_171690,
     author = {Kermit Sigmon},
     title = {Idempotent {Topological} {Groupoids} with {Non-Empty} {Center.}},
     journal = {Mathematische Zeitschrift},
     pages = {70--78},
     publisher = {mathdoc},
     volume = {125},
     year = {1972},
     zbl = {0225.55008},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171690/}
}
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Kermit Sigmon. Idempotent Topological Groupoids with Non-Empty Center.. Mathematische Zeitschrift, Tome 125 (1972), pp. 70-78. http://geodesic.mathdoc.fr/item/MZ_1972__125_171690/