@article{PMFA_1960__5_5_a5,
     author = {\'Ulehla, Ivan},
     title = {Bude se prodlu\v{z}ovat \v{c}as v kosmick\'ych raket\'ach?},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {573--582},
     publisher = {mathdoc},
     volume = {05},
     number = {5},
     year = {1960},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1960__5_5_a5/}
}