%0 Journal Article %A Nebeský, Ladislav %T A planar test of linguistic projectivity %J Kybernetika %D 1972 %P 351-354 %V 8 %N 4 %U http://geodesic.mathdoc.fr/item/KYB_1972_8_4_a6/ %G en %F KYB_1972_8_4_a6