@misc{KYB_1971_7_2_a9,
     title = {Zpr\'avy},
     journal = {Kybernetika},
     pages = {179--180},
     year = {1971},
     volume = {7},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/KYB_1971_7_2_a9/}
}