@article{PMFA_1958_3_5_a4,
     author = {Zachoval, Ladislav},
     title = {V\'yznam um\v{e}l\'ych dru\v{z}ic pro n\v{e}kter\'e z\'akladn{\'\i} fysik\'aln{\'\i} ot\'azky},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {536--541},
     year = {1958},
     volume = {3},
     number = {5},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1958_3_5_a4/}
}