@article{PMFA_1981_26_2_a7,
     author = {\v{S}t\v{e}p\'anek, Petr},
     title = {Co je {LOGO?}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {98--105},
     year = {1981},
     volume = {26},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1981_26_2_a7/}
}