@article{10_21136_CMJ_1974_101281,
     author = {Havel, V\'aclav},
     title = {A general coordinatization principle for projective planes with comparison of {Hall} and {Hughes} frames and with examples of generalized oval frames},
     journal = {Czechoslovak Mathematical Journal},
     pages = {664--673},
     year = {1974},
     volume = {24},
     number = {4},
     doi = {10.21136/CMJ.1974.101281},
     mrnumber = {0358558},
     zbl = {0331.50013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1974.101281/}
}