@misc{KYB_1981_17_6_a9,
     title = {Zpr\'avy},
     journal = {Kybernetika},
     pages = {570--572},
     year = {1981},
     volume = {17},
     number = {6},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/KYB_1981_17_6_a9/}
}