@article{10_21136_CPM_1976_117931,
     author = {Zaj{\'\i}\v{c}ek, Lud\v{e}k},
     title = {Sets of $\sigma$-porosity and sets of $\sigma $-porosity $(q)$},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {350--359},
     publisher = {mathdoc},
     volume = {101},
     number = {4},
     year = {1976},
     doi = {10.21136/CPM.1976.117931},
     mrnumber = {0457731},
     zbl = {0341.30026},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1976.117931/}
}