Geodesic
The hypergroups of order 3 over a group arising from the dihedral group of order 18
Fundamentalʹnaâ i prikladnaâ matematika, Tome 18 (2013) no. 6, pp. 95-110 
S. H. Dalalyan; P. Zolfaghari. The hypergroups of order 3 over a group arising from the dihedral group of order 18. Fundamentalʹnaâ i prikladnaâ matematika, Tome 18 (2013) no. 6, pp. 95-110. http://geodesic.mathdoc.fr/item/FPM_2013_18_6_a5/
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Voir la notice de l'article provenant de la source Math-Net.Ru

We describe up to isomorphism all unitary hypergroups of order 3 over a group that arise from the dihedral group $\mathrm D_9$.

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[9] Zolfaghari P., “The hypergroups of order $3$, arising from symmetric group $S_3$”, Proc. of the Fourth Int. Group Theory Conf. of Iran, Isfahan, 2012, 198–201