@misc{KYB_1990_26_6_a7,
     title = {Zpr\'avy},
     journal = {Kybernetika},
     pages = {517--520},
     year = {1990},
     volume = {26},
     number = {6},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/KYB_1990_26_6_a7/}
}