@article{CMJ_2004__54_3_a1,
     author = {\v{S}ilhav\'y, M.},
     title = {On semiconvexity properties of rotationally invariant functions in two dimensions},
     journal = {Czechoslovak Mathematical Journal},
     pages = {559--571},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {2004},
     mrnumber = {2086716},
     zbl = {1080.49013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2004__54_3_a1/}
}