@article{CMUC_1973_14_1_a13,
     author = {Kepka, Tom\'a\v{s}},
     title = {On one class of purities},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {139--154},
     year = {1973},
     volume = {14},
     number = {1},
     mrnumber = {0320072},
     zbl = {0258.16019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1973_14_1_a13/}
}