@article{10_21136_CPM_1981_108280,
     author = {N\'aden{\'\i}k, Zbyn\v{e}k},
     title = {Eine geometrische {Anwendung} eines {Seitenst\"uckes} zur {Ungleichung} von {Wirtinger}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {42--47},
     year = {1981},
     volume = {106},
     number = {1},
     doi = {10.21136/CPM.1981.108280},
     mrnumber = {613704},
     zbl = {0455.52003},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1981.108280/}
}