@article{106577,
author = {Josef Ml\v cek},
title = {Set-like equivalence and inner and outer cuts},
journal = {Commentationes Mathematicae Universitatis Carolinae},
volume = {028},
year = {1987},
pages = {635-647},
zbl = {0639.03057},
mrnumber = {928678},
language = {en},
url = {http://dml.mathdoc.fr/item/106577}
}
Mlček, Josef. Set-like equivalence and inner and outer cuts. Commentationes Mathematicae Universitatis Carolinae, Tome 028 (1987) pp. 635-647. http://gdmltest.u-ga.fr/item/106577/
Mathematics in the Alternative Set Theory, Teubner-Texte, Leipzig, 1979. (1979) | MR 0581368
Approximation of $\sigma $-classes and $\pi $-classes, Comment. Math. Univ. Carolinae 20 (1979), 669-679. (1979) | MR 0555182