%0 Journal Article %A Červeňanský, Jaroslav %A Šalát, Tibor %T Convergence preserving permutations of $\Bbb N$ and Fréchet's space of permutations of $\Bbb N$ %J Mathematica slovaca %D 1999 %P 189-199 %V 49 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1999__49_2_a5/ %G en %F MASLO_1999__49_2_a5