Geodesic
Approximations of $\sigma$-classes and $\pi$-classes
Commentationes Mathematicae Universitatis Carolinae, Tome 20 (1979) no. 4, pp. 669-679.

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Classification : 02K10, 02K99, 03E70, 04A99 
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     title = {Approximations of $\sigma$-classes and $\pi$-classes},
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Mlček, Josef. Approximations of $\sigma$-classes and $\pi$-classes. Commentationes Mathematicae Universitatis Carolinae, Tome 20 (1979) no. 4, pp. 669-679. http://geodesic.mathdoc.fr/item/CMUC_1979__20_4_a4/