@article{10_21136_CMJ_1967_100757,
     author = {Proch\'azka, Ladislav},
     title = {{\CYRZ}{\cyra}{\cyrm}{\cyre}{\cyrt}{\cyrk}{\cyra} {\cyro} {\cyrp}{\cyrr}{\cyrya}{\cyrm}{\cyrery}{\cyrh} {\cyrs}{\cyru}{\cyrm}{\cyrm}{\cyra}{\cyrh} {\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp} {\cyrt}{\cyri}{\cyrp}{\cyra} ${\frak P}^+$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {28--35},
     year = {1967},
     volume = {17},
     number = {1},
     doi = {10.21136/CMJ.1967.100757},
     mrnumber = {0206103},
     zbl = {0207.33305},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1967.100757/}
}