@article{10_21136_CMJ_1968_100845,
     author = {Nov\'ak, Josef},
     title = {On sequential envelopes defined by means of certain classes of continuous functions},
     journal = {Czechoslovak Mathematical Journal},
     pages = {450--456},
     year = {1968},
     volume = {18},
     number = {3},
     doi = {10.21136/CMJ.1968.100845},
     mrnumber = {0232335},
     zbl = {0164.23401},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1968.100845/}
}