@article{PMFA_1959_4_5_a4,
     author = {Kratochv{\'\i}lov\'a, Karla and Tich\'y, Jan and Zelenka, Ji\v{r}{\'\i}},
     title = {V\'yznam pojmu resonan\v{c}n{\'\i} frekvence piezoelektrick\'eho v\'ybrusu},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {563--570},
     year = {1959},
     volume = {4},
     number = {5},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1959_4_5_a4/}
}