@article{PMFA_2001_46_2_a1,
     author = {Hales, Thomas C.},
     title = {D\v{e}lov\'e koule a~v\v{c}el{\'\i} pl\'asty},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {101--118},
     year = {2001},
     volume = {46},
     number = {2},
     zbl = {1048.52010},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_2001_46_2_a1/}
}