@article{KYB_1989__25_6_a9,
     author = {Vlk, Tom\'a\v{s}},
     title = {Semantic analysis of topic and focus},
     journal = {Kybernetika},
     pages = {523--532},
     publisher = {mathdoc},
     volume = {25},
     number = {6},
     year = {1989},
     zbl = {0703.03009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1989__25_6_a9/}
}