Geodesic
Generators of $\sigma$- and $\pi$-classes
Matematičeskie zametki, Tome 61 (1997) no. 6, pp. 943-945 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {S. D. Kozlov and S. V. Dronov},
     title = {Generators of $\sigma$- and $\pi$-classes},
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S. D. Kozlov; S. V. Dronov. Generators of $\sigma$- and $\pi$-classes. Matematičeskie zametki, Tome 61 (1997) no. 6, pp. 943-945. http://geodesic.mathdoc.fr/item/MZM_1997_61_6_a15/

[1] Vopenka P., Matematika v alternativnoi teorii mnozhestv, Mir, M., 1983