@article{CMUC_2010_51_3_a6,
     author = {Zaj{\'\i}\v{c}ek, Lud\v{e}k},
     title = {A note on propagation of singularities of semiconcave functions of two variables},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {453--458},
     year = {2010},
     volume = {51},
     number = {3},
     mrnumber = {2741878},
     zbl = {1224.26047},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2010_51_3_a6/}
}