@article{10_21136_MB_1991_126170,
     author = {Guldan, Filip},
     title = {On a problem of colouring the real plane},
     journal = {Mathematica Bohemica},
     pages = {309--318},
     publisher = {mathdoc},
     volume = {116},
     number = {3},
     year = {1991},
     doi = {10.21136/MB.1991.126170},
     mrnumber = {1126452},
     zbl = {0758.05052},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1991.126170/}
}