@article{10_21136_MB_1992_126285,
     author = {Duda, Jarom{\'\i}r},
     title = {Congruence restrictions on axes},
     journal = {Mathematica Bohemica},
     pages = {251--258},
     publisher = {mathdoc},
     volume = {117},
     number = {3},
     year = {1992},
     doi = {10.21136/MB.1992.126285},
     mrnumber = {1184538},
     zbl = {0777.08003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1992.126285/}
}