Geodesic
Optimality solutions in games with preference relations
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 11 (2011) no. 2, pp. 32-36.

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For $n$ person games with preference relations some types of optimality solutions are introduced. Elementary properties of their solutions are considered. One sufficient condition for nonempty $C_\alpha$-core is found. 
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T. F. Savina. Optimality solutions in games with preference relations. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 11 (2011) no. 2, pp. 32-36. http://geodesic.mathdoc.fr/item/ISU_2011_11_2_a4/

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[2] Savina T. F., “Kovariantnye i kontravariantnye gomomorfizmy igr s otnosheniyami predpochteniya”, Izv. Sarat. un-ta. Nov. ser. Matematika. Mekhanika. Informatika, 9:3 (2009), 66–70