@article{AUPO_2006__45_1_a2,
     author = {Chajda, Ivan},
     title = {Directoids with sectionally switching involutions},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {2006},
     mrnumber = {2321295},
     zbl = {1123.06001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2006__45_1_a2/}
}