@article{10_21136_CMJ_1995_128548,
     author = {Nebesk\'y, Ladislav},
     title = {Visibilities and sets of shortest paths in a connected graph},
     journal = {Czechoslovak Mathematical Journal},
     pages = {563--570},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1995},
     doi = {10.21136/CMJ.1995.128548},
     mrnumber = {1344521},
     zbl = {0856.05059},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1995.128548/}
}