@article{CMJ_2005__55_2_a1,
     author = {Nebesk\'y, Ladislav},
     title = {On signpost systems and connected graphs},
     journal = {Czechoslovak Mathematical Journal},
     pages = {283--293},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {2005},
     mrnumber = {2137138},
     zbl = {1081.05054},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2005__55_2_a1/}
}