@article{AUPO_2001_40_1_a2,
     author = {Chajda, Ivan},
     title = {A common generalization of permutability and 0-permutability},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {23--29},
     year = {2001},
     volume = {40},
     number = {1},
     mrnumber = {1904680},
     zbl = {1038.08004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2001_40_1_a2/}
}