@article{10_14712_1213_7243_2023_011,
     author = {Logunov, Sergei},
     title = {On {Szyma\'nski} theorem on hereditary normality of $\beta\omega$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {507--512},
     year = {2022},
     volume = {63},
     number = {4},
     doi = {10.14712/1213-7243.2023.011},
     mrnumber = {4577044},
     zbl = {07729556},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.14712/1213-7243.2023.011/}
}