Geodesic
Some remarks on nonmeasurable almost invariant sets
Acta Universitatis Lodziensis. Folia Mathematica, Tome 07 (1995).

Voir la notice de l'article provenant de la source University of Lodz Repository

We discuss some properties of almost invariant sets in connection with a measure extension problem. We consider a question on the existence of an almost invariant subset of a basic space, nonmeasurable with respect to a given nonzero (δ-finite quasiinvariant (in particular, invariant) measure defined on this space. 
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     author = {Kharazishvili, Aleksander},
     title = {Some remarks on nonmeasurable almost invariant sets},
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Kharazishvili, Aleksander. Some remarks on nonmeasurable almost invariant sets. Acta Universitatis Lodziensis. Folia Mathematica, Tome 07 (1995). http://geodesic.mathdoc.fr/item/AULFM_1995_07_a7/