@article{CMUC_1992_33_3_a19,
     author = {Navara, Mirko},
     title = {Announcements of new results},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {571},
     year = {1992},
     volume = {33},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1992_33_3_a19/}
}