@article{CMUC_1965__6_4_a5,
     author = {Hrb\'a\v{c}ek, Karel},
     title = {Model $\nabla[\omega_\alpha\to\omega_\beta]$ in which $\beta$ is limit number},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {439--442},
     publisher = {mathdoc},
     volume = {06},
     number = {4},
     year = {1965},
     mrnumber = {0200136},
     zbl = {0139.24607},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1965__6_4_a5/}
}