@article{10_21136_CMJ_1979_101640,
     author = {Chajda, Ivan and Zelinka, Bohdan},
     title = {Tolerances and convexity},
     journal = {Czechoslovak Mathematical Journal},
     pages = {584--587},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1979},
     doi = {10.21136/CMJ.1979.101640},
     mrnumber = {548221},
     zbl = {0407.06002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1979.101640/}
}