Geodesic
Regular semihypergroups
Sbornik. Mathematics, Tome 76 (1993) no. 1, pp. 155-164

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Necessary and sufficient conditions are established for a locally compact semihypergroup to have an invariant measure – an analogue of Haar measure for groups. 
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S. V. Onipchuk. Regular semihypergroups. Sbornik. Mathematics, Tome 76 (1993) no. 1, pp. 155-164. http://geodesic.mathdoc.fr/item/SM_1993_76_1_a7/