@article{CMUC_2009__50_3_a2,
     author = {Chajda, Ivan},
     title = {Relatively pseudocomplemented directoids},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {349--357},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {2009},
     mrnumber = {2573409},
     zbl = {1212.06004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2009__50_3_a2/}
}