@article{RMF_2005_80_1_a3,
     author = {Mach\'a\v{c}ek, Martin},
     title = {Pro\v{c} se sekunda definuje tak slo\v{z}it\v{e}?},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {15--25},
     year = {2005},
     volume = {80},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/RMF_2005_80_1_a3/}
}