@article{10_21136_AM_1959_102684,
     author = {Jano\v{s}, Ludv{\'\i}k},
     title = {Extrem\'aln{\'\i} princip pro prvn{\'\i} vlastn{\'\i} frekvenci p\v{r}{\'\i}\v{c}n\'ych kmit\r{u} pru\v{z}n\'eho kontinua},
     journal = {Applications of Mathematics},
     pages = {456--462},
     publisher = {mathdoc},
     volume = {04},
     number = {6},
     year = {1959},
     doi = {10.21136/AM.1959.102684},
     mrnumber = {0127615},
     zbl = {0093.40301},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1959.102684/}
}