@article{UM_1999_7_2_a7,
     author = {Ko\v{c}andrlov\'a, Milada},
     title = {Heron\r{u}v vzorec v {\v{C}asopise} pro p\v{e}stov\'an{\'\i} matematiky a fyziky},
     journal = {U\v{c}itel matematiky},
     pages = {110--116},
     year = {1999},
     volume = {7},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1999_7_2_a7/}
}