@misc{KYB_1968_4_5_a10,
     title = {Zpr\'avy},
     journal = {Kybernetika},
     pages = {502--504},
     year = {1968},
     volume = {4},
     number = {5},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/KYB_1968_4_5_a10/}
}