On isomorphisms between $\sigma$-ideals on $\omega_1$
Commentationes Mathematicae Universitatis Carolinae, Tome 31 (1990) no. 4, pp. 743-749.

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Classification : 03E05, 04A05, 04A20
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     title = {On isomorphisms between $\sigma$-ideals on $\omega_1$},
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Balcerzak, Marek. On isomorphisms between $\sigma$-ideals on $\omega_1$. Commentationes Mathematicae Universitatis Carolinae, Tome 31 (1990) no. 4, pp. 743-749. http://geodesic.mathdoc.fr/item/CMUC_1990__31_4_a13/