@article{PMFA_1986_31_2_a5,
     author = {Ewing, John},
     title = {Poru\v{s}en{\'\i} etikety},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {111--112},
     year = {1986},
     volume = {31},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1986_31_2_a5/}
}