@article{10_21136_CMJ_1964_100619,
     author = {Kr\'al, Josef},
     title = {Some inequalities concerning the cyclic and radial variations of a plane path-curve},
     journal = {Czechoslovak Mathematical Journal},
     pages = {271--280},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1964},
     doi = {10.21136/CMJ.1964.100619},
     mrnumber = {0180689},
     zbl = {0151.16101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1964.100619/}
}