@article{CMUC_1979_20_1_a22,
     author = {Fri\v{c}, Roman and Hu\v{s}ek, Miroslav},
     title = {$E$-sequential envelopes},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {194},
     year = {1979},
     volume = {20},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1979_20_1_a22/}
}