@article{RMF_2007__82_4_a6,
     author = {Volf, Ivo},
     title = {\'Ulohy pro 49. ro\v{c}n{\'\i}k {Fyzik\'aln{\'\i}} olympi\'ady, kategorie {E,} {F}},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {34--40},
     publisher = {mathdoc},
     volume = {82},
     number = {4},
     year = {2007},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/RMF_2007__82_4_a6/}
}