%0 Journal Article %A Novák, Josef %T On sequential envelopes defined by means of certain classes of continuous functions %J Czechoslovak Mathematical Journal %D 1968 %P 450-456 %V 18 %N 3 %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1968.100845/ %R 10.21136/CMJ.1968.100845 %G en %F 10_21136_CMJ_1968_100845