@article{KYB_1972_8_4_a6,
     author = {Nebesk\'y, Ladislav},
     title = {A planar test of linguistic projectivity},
     journal = {Kybernetika},
     pages = {351--354},
     year = {1972},
     volume = {8},
     number = {4},
     mrnumber = {0451892},
     zbl = {0245.68016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1972_8_4_a6/}
}