@article{CMUC_2007_48_4_a0,
     author = {Chajda, I. and Kola\v{r}{\'\i}k, M.},
     title = {Directoids with an antitone involution},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {555--569},
     year = {2007},
     volume = {48},
     number = {4},
     mrnumber = {2375158},
     zbl = {1199.06012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2007_48_4_a0/}
}