@article{10_21136_CMJ_1953_100089,
     author = {Nov\'ak, Josef and Novotn\'y, Miroslav},
     title = {On the convergence in $\sigma$-algebras of point-sets},
     journal = {Czechoslovak Mathematical Journal},
     pages = {291--296},
     publisher = {mathdoc},
     volume = {03},
     number = {3},
     year = {1953},
     doi = {10.21136/CMJ.1953.100089},
     mrnumber = {0060572},
     zbl = {0052.28304},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1953.100089/}
}