@article{PMFA_1974__19_5_a3,
     author = {Vyb{\'\i}ral, Bohumil},
     title = {K problematice setrva\v{c}n\'e a gravita\v{c}n{\'\i} hmotnosti},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {270--280},
     publisher = {mathdoc},
     volume = {19},
     number = {5},
     year = {1974},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1974__19_5_a3/}
}